diff --git a/libc/src/string/memory_utils/op_x86.h b/libc/src/string/memory_utils/op_x86.h
index 1a20659c178cd..3d2eb13fa302a 100644
--- a/libc/src/string/memory_utils/op_x86.h
+++ b/libc/src/string/memory_utils/op_x86.h
@@ -233,7 +233,8 @@ template <> LIBC_INLINE uint32_t neq<__m512i>(CPtr p1, CPtr p2, size_t offset) {
   const auto a = load<__m512i>(p1, offset);
   const auto b = load<__m512i>(p2, offset);
   const uint64_t xored = _mm512_cmpneq_epi8_mask(a, b);
-  return (xored >> 32) | (xored & 0xFFFFFFFF);
+  return static_cast<uint32_t>(xored >> 32) |
+         static_cast<uint32_t>(xored & 0xFFFFFFFF));
 }
 template <>
 LIBC_INLINE MemcmpReturnType cmp_neq<__m512i>(CPtr p1, CPtr p2, size_t offset) {