diff --git a/runtime/rust_backend/Runtime.cpp b/runtime/rust_backend/Runtime.cpp
index 91adf9e9..a00ff4f9 100644
--- a/runtime/rust_backend/Runtime.cpp
+++ b/runtime/rust_backend/Runtime.cpp
@@ -205,6 +205,7 @@ DEF_BINARY_BV_EXPR_BUILDER(fp_rem)
 #undef DEF_BINARY_BV_EXPR_BUILDER
 
 DEF_UNARY_EXPR_BUILDER(fp_abs)
+DEF_UNARY_EXPR_BUILDER(fp_neg)
 
 DEF_UNARY_EXPR_BUILDER(not )
 DEF_BINARY_BOOL_EXPR_BUILDER(not_equal)
@@ -227,6 +228,11 @@ DEF_BINARY_BOOL_EXPR_BUILDER(float_unordered_not_equal)
 
 #undef DEF_BINARY_BOOL_EXPR_BUILDER
 
+SymExpr _sym_build_ite(SymExpr cond, SymExpr a, SymExpr b) {
+  return registerExpression(symexpr(
+      _rsym_build_ite(symexpr_id(cond), symexpr_id(a), symexpr_id(b)), 0));
+}
+
 SymExpr _sym_build_sext(SymExpr expr, uint8_t bits) {
   return registerExpression(symexpr(_rsym_build_sext(symexpr_id(expr), bits),
                                     symexpr_width(expr) + bits));
diff --git a/runtime/rust_backend/RustRuntime.h b/runtime/rust_backend/RustRuntime.h
index 7789a86f..766faa41 100644
--- a/runtime/rust_backend/RustRuntime.h
+++ b/runtime/rust_backend/RustRuntime.h
@@ -66,6 +66,7 @@ RSymExpr _rsym_build_fp_mul(RSymExpr a, RSymExpr b);
 RSymExpr _rsym_build_fp_div(RSymExpr a, RSymExpr b);
 RSymExpr _rsym_build_fp_rem(RSymExpr a, RSymExpr b);
 RSymExpr _rsym_build_fp_abs(RSymExpr a);
+RSymExpr _rsym_build_fp_neg(RSymExpr a);
 
 /*
  * Boolean operations
@@ -87,6 +88,7 @@ RSymExpr _rsym_build_bool_or(RSymExpr a, RSymExpr b);
 RSymExpr _rsym_build_or(RSymExpr a, RSymExpr b);
 RSymExpr _rsym_build_bool_xor(RSymExpr a, RSymExpr b);
 RSymExpr _rsym_build_xor(RSymExpr a, RSymExpr b);
+RSymExpr _rsym_build_ite(RSymExpr cond, RSymExpr a, RSymExpr b);
 
 RSymExpr _rsym_build_float_ordered_greater_than(RSymExpr a, RSymExpr b);
 RSymExpr _rsym_build_float_ordered_greater_equal(RSymExpr a, RSymExpr b);