Index: include/clang/Basic/BuiltinsWebAssembly.def
===================================================================
--- include/clang/Basic/BuiltinsWebAssembly.def
+++ include/clang/Basic/BuiltinsWebAssembly.def
@@ -37,7 +37,7 @@
 // Atomic wait and notify.
 BUILTIN(__builtin_wasm_atomic_wait_i32, "ii*iLLi", "n")
 BUILTIN(__builtin_wasm_atomic_wait_i64, "iLLi*LLiLLi", "n")
-BUILTIN(__builtin_wasm_atomic_notify, "Uii*i", "n")
+BUILTIN(__builtin_wasm_atomic_notify, "Uii*Ui", "n")
 
 // Saturating fp-to-int conversions
 BUILTIN(__builtin_wasm_trunc_saturate_s_i32_f32, "if", "nc")
Index: test/CodeGen/builtins-wasm.c
===================================================================
--- test/CodeGen/builtins-wasm.c
+++ test/CodeGen/builtins-wasm.c
@@ -77,7 +77,7 @@
   // WEBASSEMBLY64: call i32 @llvm.wasm.atomic.wait.i64(i64* %{{.*}}, i64 %{{.*}}, i64 %{{.*}})
 }
 
-unsigned int atomic_notify(int *addr, int count) {
+unsigned int atomic_notify(int *addr, unsigned int count) {
   return __builtin_wasm_atomic_notify(addr, count);
   // WEBASSEMBLY32: call i32 @llvm.wasm.atomic.notify(i32* %{{.*}}, i32 %{{.*}})
   // WEBASSEMBLY64: call i32 @llvm.wasm.atomic.notify(i32* %{{.*}}, i32 %{{.*}})