diff --git a/compiler/rustc_index_macros/src/newtype.rs b/compiler/rustc_index_macros/src/newtype.rs
index df1318c835e2b..ede8416125d6a 100644
--- a/compiler/rustc_index_macros/src/newtype.rs
+++ b/compiler/rustc_index_macros/src/newtype.rs
@@ -263,6 +263,7 @@ impl Parse for Newtype {
             impl std::ops::Add<usize> for #name {
                 type Output = Self;
 
+                #[inline]
                 fn add(self, other: usize) -> Self {
                     Self::from_usize(self.index() + other)
                 }
diff --git a/compiler/rustc_query_system/src/dep_graph/serialized.rs b/compiler/rustc_query_system/src/dep_graph/serialized.rs
index 504763f6cdb38..f6f6aa07cb3f6 100644
--- a/compiler/rustc_query_system/src/dep_graph/serialized.rs
+++ b/compiler/rustc_query_system/src/dep_graph/serialized.rs
@@ -169,6 +169,7 @@ impl EdgeHeader {
     }
 }
 
+#[inline]
 fn mask(bits: usize) -> usize {
     usize::MAX >> ((std::mem::size_of::<usize>() * 8) - bits)
 }