diff --git a/crates/mun_codegen/src/ir/body.rs b/crates/mun_codegen/src/ir/body.rs
index ef3017f53..7f4431341 100644
--- a/crates/mun_codegen/src/ir/body.rs
+++ b/crates/mun_codegen/src/ir/body.rs
@@ -280,6 +280,9 @@ impl<'a, 'b, D: IrDatabase> BodyIrGenerator<'a, 'b, D> {
                     hir::IntBitness::X16 => context.i16_type().const_int(v.value as u64, has_sign),
                     hir::IntBitness::X32 => context.i32_type().const_int(v.value as u64, has_sign),
                     hir::IntBitness::X64 => context.i64_type().const_int(v.value as u64, has_sign),
+                    hir::IntBitness::X128 => {
+                        context.i128_type().const_int(v.value as u64, has_sign)
+                    }
                     _ => unreachable!("unresolved bitness in code generation"),
                 };
 
diff --git a/crates/mun_codegen/src/snapshots/test__literal_types.snap b/crates/mun_codegen/src/snapshots/test__literal_types.snap
index 617fa76ed..5fa15ca2b 100644
--- a/crates/mun_codegen/src/snapshots/test__literal_types.snap
+++ b/crates/mun_codegen/src/snapshots/test__literal_types.snap
@@ -1,6 +1,6 @@
 ---
 source: crates/mun_codegen/src/test.rs
-expression: "pub fn main(){\n    let a = 123;\n    let a = 123u8;\n    let a = 123u16;\n    let a = 123u32;\n    let a = 123u64;\n    let a = 123uint;\n    let a = 1_000_000_u32;\n    let a = 123i8;\n    let a = 123i16;\n    let a = 123i32;\n    let a = 123i64;\n    let a = 123int;\n    let a = 1_000_000_i32;\n    let a = 1_000_123.0e-2;\n    let a = 1_000_123.0e-2f32;\n    let a = 1_000_123.0e-2f64;\n    let a = 1_000_123.0e-2float;\n}\n\npub fn add(a:u32) -> u32 {\n    a + 12u32\n}"
+expression: "pub fn main(){\n    let a = 123;\n    let a = 123u8;\n    let a = 123u16;\n    let a = 123u32;\n    let a = 123u64;\n    let a = 123u128;\n    let a = 123uint;\n    let a = 1_000_000_u32;\n    let a = 123i8;\n    let a = 123i16;\n    let a = 123i32;\n    let a = 123i64;\n    let a = 123i128;\n    let a = 123int;\n    let a = 1_000_000_i32;\n    let a = 1_000_123.0e-2;\n    let a = 1_000_123.0e-2f32;\n    let a = 1_000_123.0e-2f64;\n    let a = 1_000_123.0e-2float;\n}\n\npub fn add(a:u32) -> u32 {\n    a + 12u32\n}"
 ---
 ; == FILE IR =====================================
 ; ModuleID = 'main.mun'
@@ -12,18 +12,20 @@ source_filename = "main.mun"
 
 define void @main() {
 body:
-  %a16 = alloca double
+  %a18 = alloca double
+  %a17 = alloca double
+  %a16 = alloca float
   %a15 = alloca double
-  %a14 = alloca float
-  %a13 = alloca double
-  %a12 = alloca i32
+  %a14 = alloca i32
+  %a13 = alloca i64
+  %a12 = alloca i128
   %a11 = alloca i64
-  %a10 = alloca i64
-  %a9 = alloca i32
-  %a8 = alloca i16
-  %a7 = alloca i8
-  %a6 = alloca i32
-  %a5 = alloca i64
+  %a10 = alloca i32
+  %a9 = alloca i16
+  %a8 = alloca i8
+  %a7 = alloca i32
+  %a6 = alloca i64
+  %a5 = alloca i128
   %a4 = alloca i64
   %a3 = alloca i32
   %a2 = alloca i16
@@ -34,18 +36,20 @@ body:
   store i16 123, i16* %a2
   store i32 123, i32* %a3
   store i64 123, i64* %a4
-  store i64 123, i64* %a5
-  store i32 1000000, i32* %a6
-  store i8 123, i8* %a7
-  store i16 123, i16* %a8
-  store i32 123, i32* %a9
-  store i64 123, i64* %a10
+  store i128 123, i128* %a5
+  store i64 123, i64* %a6
+  store i32 1000000, i32* %a7
+  store i8 123, i8* %a8
+  store i16 123, i16* %a9
+  store i32 123, i32* %a10
   store i64 123, i64* %a11
-  store i32 1000000, i32* %a12
-  store double 0x40C3889D70A3D70A, double* %a13
-  store float 0x40C3889D80000000, float* %a14
+  store i128 123, i128* %a12
+  store i64 123, i64* %a13
+  store i32 1000000, i32* %a14
   store double 0x40C3889D70A3D70A, double* %a15
-  store double 0x40C3889D70A3D70A, double* %a16
+  store float 0x40C3889D80000000, float* %a16
+  store double 0x40C3889D70A3D70A, double* %a17
+  store double 0x40C3889D70A3D70A, double* %a18
   ret void
 }
 
diff --git a/crates/mun_codegen/src/snapshots/test__literal_types_file_ir.snap b/crates/mun_codegen/src/snapshots/test__literal_types_file_ir.snap
index 27ee262cd..f28141166 100644
--- a/crates/mun_codegen/src/snapshots/test__literal_types_file_ir.snap
+++ b/crates/mun_codegen/src/snapshots/test__literal_types_file_ir.snap
@@ -1,24 +1,26 @@
 ---
 source: crates/mun_codegen/src/test.rs
-expression: "fn main(){\n    let a = 123;\n    let a = 123u8;\n    let a = 123u16;\n    let a = 123u32;\n    let a = 123u64;\n    let a = 123uint;\n    let a = 1_000_000_u32;\n    let a = 123i8;\n    let a = 123i16;\n    let a = 123i32;\n    let a = 123i64;\n    let a = 123int;\n    let a = 1_000_000_i32;\n    let a = 1_000_123.0e-2;\n    let a = 1_000_123.0e-2f32;\n    let a = 1_000_123.0e-2f64;\n    let a = 1_000_123.0e-2float;\n}\n\nfn add(a:u32): u32 {\n    a + 12u32\n}"
+expression: "fn main(){\n    let a = 123;\n    let a = 123u8;\n    let a = 123u16;\n    let a = 123u32;\n    let a = 123u64;\n    let a = 123u128;\n    let a = 123uint;\n    let a = 1_000_000_u32;\n    let a = 123i8;\n    let a = 123i16;\n    let a = 123i32;\n    let a = 123i64;\n    let a = 123i128;\n    let a = 123int;\n    let a = 1_000_000_i32;\n    let a = 1_000_123.0e-2;\n    let a = 1_000_123.0e-2f32;\n    let a = 1_000_123.0e-2f64;\n    let a = 1_000_123.0e-2float;\n}\n\nfn add(a:u32) -> u32 {\n    a + 12u32\n}"
 ---
 ; ModuleID = 'main.mun'
 source_filename = "main.mun"
 
 define void @main() {
 body:
-  %a16 = alloca double
+  %a18 = alloca double
+  %a17 = alloca double
+  %a16 = alloca float
   %a15 = alloca double
-  %a14 = alloca float
-  %a13 = alloca double
-  %a12 = alloca i32
+  %a14 = alloca i32
+  %a13 = alloca i64
+  %a12 = alloca i128
   %a11 = alloca i64
-  %a10 = alloca i64
-  %a9 = alloca i32
-  %a8 = alloca i16
-  %a7 = alloca i8
-  %a6 = alloca i32
-  %a5 = alloca i64
+  %a10 = alloca i32
+  %a9 = alloca i16
+  %a8 = alloca i8
+  %a7 = alloca i32
+  %a6 = alloca i64
+  %a5 = alloca i128
   %a4 = alloca i64
   %a3 = alloca i32
   %a2 = alloca i16
@@ -29,18 +31,20 @@ body:
   store i16 123, i16* %a2
   store i32 123, i32* %a3
   store i64 123, i64* %a4
-  store i64 123, i64* %a5
-  store i32 1000000, i32* %a6
-  store i8 123, i8* %a7
-  store i16 123, i16* %a8
-  store i32 123, i32* %a9
-  store i64 123, i64* %a10
+  store i128 123, i128* %a5
+  store i64 123, i64* %a6
+  store i32 1000000, i32* %a7
+  store i8 123, i8* %a8
+  store i16 123, i16* %a9
+  store i32 123, i32* %a10
   store i64 123, i64* %a11
-  store i32 1000000, i32* %a12
-  store double 0x40C3889D70A3D70A, double* %a13
-  store float 0x40C3889D80000000, float* %a14
+  store i128 123, i128* %a12
+  store i64 123, i64* %a13
+  store i32 1000000, i32* %a14
   store double 0x40C3889D70A3D70A, double* %a15
-  store double 0x40C3889D70A3D70A, double* %a16
+  store float 0x40C3889D80000000, float* %a16
+  store double 0x40C3889D70A3D70A, double* %a17
+  store double 0x40C3889D70A3D70A, double* %a18
   ret void
 }
 
diff --git a/crates/mun_codegen/src/test.rs b/crates/mun_codegen/src/test.rs
index c789e1bcb..aac930702 100644
--- a/crates/mun_codegen/src/test.rs
+++ b/crates/mun_codegen/src/test.rs
@@ -51,12 +51,14 @@ fn literal_types() {
         let a = 123u16;
         let a = 123u32;
         let a = 123u64;
+        let a = 123u128;
         let a = 123uint;
         let a = 1_000_000_u32;
         let a = 123i8;
         let a = 123i16;
         let a = 123i32;
         let a = 123i64;
+        let a = 123i128;
         let a = 123int;
         let a = 1_000_000_i32;
         let a = 1_000_123.0e-2;
diff --git a/crates/mun_hir/src/expr.rs b/crates/mun_hir/src/expr.rs
index 712b5a9f7..df8e5f46f 100644
--- a/crates/mun_hir/src/expr.rs
+++ b/crates/mun_hir/src/expr.rs
@@ -1139,6 +1139,17 @@ mod test {
             )
         );
 
+        assert_eq!(
+            integer_lit("1234", Some("i128")),
+            (
+                Literal::Int(LiteralInt {
+                    kind: LiteralIntKind::Suffixed(BuiltinInt::I128),
+                    value: 1234
+                }),
+                vec![]
+            )
+        );
+
         assert_eq!(
             integer_lit("1234", Some("isize")),
             (
@@ -1205,6 +1216,17 @@ mod test {
             )
         );
 
+        assert_eq!(
+            integer_lit("1234", Some("u128")),
+            (
+                Literal::Int(LiteralInt {
+                    kind: LiteralIntKind::Suffixed(BuiltinInt::U128),
+                    value: 1234
+                }),
+                vec![]
+            )
+        );
+
         assert_eq!(
             integer_lit("1234", Some("usize")),
             (
diff --git a/crates/mun_hir/src/ty/snapshots/tests__infer_suffix_literals.snap b/crates/mun_hir/src/ty/snapshots/tests__infer_suffix_literals.snap
index c5bdb460b..3159ab9fc 100644
--- a/crates/mun_hir/src/ty/snapshots/tests__infer_suffix_literals.snap
+++ b/crates/mun_hir/src/ty/snapshots/tests__infer_suffix_literals.snap
@@ -1,27 +1,29 @@
 ---
 source: crates/mun_hir/src/ty/tests.rs
-expression: "fn main(){\n    123;\n    123u8;\n    123u16;\n    123u32;\n    123u64;\n    123uint;\n    1_000_000_u32;\n    123i8;\n    123i16;\n    123i32;\n    123i64;\n    123int;\n    1_000_000_i32;\n    1_000_123.0e-2;\n    1_000_123.0e-2f32;\n    1_000_123.0e-2f64;\n    1_000_123.0e-2float;\n}\n\nfn add(a:u32) -> u32 {\n    a + 12u32\n}"
+expression: "fn main(){\n    123;\n    123u8;\n    123u16;\n    123u32;\n    123u64;\n    123u128;\n    123uint;\n    1_000_000_u32;\n    123i8;\n    123i16;\n    123i32;\n    123i64;\n    123i128;\n    123int;\n    1_000_000_i32;\n    1_000_123.0e-2;\n    1_000_123.0e-2f32;\n    1_000_123.0e-2f64;\n    1_000_123.0e-2float;\n}\n\nfn add(a:u32) -> u32 {\n    a + 12u32\n}"
 ---
-[9; 269) '{     ...oat; }': nothing
+[9; 295) '{     ...oat; }': nothing
 [15; 18) '123': int
 [24; 29) '123u8': u8
 [35; 41) '123u16': u16
 [47; 53) '123u32': u32
 [59; 65) '123u64': u64
-[71; 78) '123uint': uint
-[84; 97) '1_000_000_u32': u32
-[103; 108) '123i8': i8
-[114; 120) '123i16': i16
-[126; 132) '123i32': i32
-[138; 144) '123i64': i64
-[150; 156) '123int': int
-[162; 175) '1_000_000_i32': i32
-[181; 195) '1_000_123.0e-2': float
-[201; 218) '1_000_...e-2f32': f32
-[224; 241) '1_000_...e-2f64': f64
-[247; 266) '1_000_...2float': float
-[278; 279) 'a': u32
-[292; 309) '{     ...2u32 }': u32
-[298; 299) 'a': u32
-[298; 307) 'a + 12u32': u32
-[302; 307) '12u32': u32
+[71; 78) '123u128': u128
+[84; 91) '123uint': uint
+[97; 110) '1_000_000_u32': u32
+[116; 121) '123i8': i8
+[127; 133) '123i16': i16
+[139; 145) '123i32': i32
+[151; 157) '123i64': i64
+[163; 170) '123i128': i128
+[176; 182) '123int': int
+[188; 201) '1_000_000_i32': i32
+[207; 221) '1_000_123.0e-2': float
+[227; 244) '1_000_...e-2f32': f32
+[250; 267) '1_000_...e-2f64': f64
+[273; 292) '1_000_...2float': float
+[304; 305) 'a': u32
+[318; 335) '{     ...2u32 }': u32
+[324; 325) 'a': u32
+[324; 333) 'a + 12u32': u32
+[328; 333) '12u32': u32
diff --git a/crates/mun_hir/src/ty/tests.rs b/crates/mun_hir/src/ty/tests.rs
index 105afb337..e0f2a7643 100644
--- a/crates/mun_hir/src/ty/tests.rs
+++ b/crates/mun_hir/src/ty/tests.rs
@@ -18,12 +18,14 @@ fn infer_suffix_literals() {
         123u16;
         123u32;
         123u64;
+        123u128;
         123uint;
         1_000_000_u32;
         123i8;
         123i16;
         123i32;
         123i64;
+        123i128;
         123int;
         1_000_000_i32;
         1_000_123.0e-2;