diff --git a/compiler/rustc_codegen_gcc/example/example.rs b/compiler/rustc_codegen_gcc/example/example.rs
index 5878e8548d926..7c21b73b630e8 100644
--- a/compiler/rustc_codegen_gcc/example/example.rs
+++ b/compiler/rustc_codegen_gcc/example/example.rs
@@ -153,9 +153,10 @@ fn array_as_slice(arr: &[u8; 3]) -> &[u8] {
     arr
 }
 
-unsafe fn use_ctlz_nonzero(a: u16) -> u16 {
-    intrinsics::ctlz_nonzero(a)
-}
+// FIXME: fix the intrinsic implementation to work with the new ->u32 signature
+// unsafe fn use_ctlz_nonzero(a: u16) -> u32 {
+//     intrinsics::ctlz_nonzero(a)
+// }
 
 fn ptr_as_usize(ptr: *const u8) -> usize {
     ptr as usize
diff --git a/compiler/rustc_codegen_gcc/example/mini_core.rs b/compiler/rustc_codegen_gcc/example/mini_core.rs
index 4665009e191e6..8ffa66a489464 100644
--- a/compiler/rustc_codegen_gcc/example/mini_core.rs
+++ b/compiler/rustc_codegen_gcc/example/mini_core.rs
@@ -593,7 +593,7 @@ pub mod intrinsics {
         pub fn min_align_of_val<T: ?Sized>(val: *const T) -> usize;
         pub fn copy<T>(src: *const T, dst: *mut T, count: usize);
         pub fn transmute<T, U>(e: T) -> U;
-        pub fn ctlz_nonzero<T>(x: T) -> T;
+        pub fn ctlz_nonzero<T>(x: T) -> u32;
         #[rustc_safe_intrinsic]
         pub fn needs_drop<T: ?Sized>() -> bool;
         #[rustc_safe_intrinsic]