diff --git a/upb/upb.h b/upb/upb.h
index 0d15d5db92..85205a5a76 100644
--- a/upb/upb.h
+++ b/upb/upb.h
@@ -301,7 +301,7 @@ UPB_INLINE uint32_t _upb_be_swap32(uint32_t val) {
     return val;
   } else {
     return ((val & 0xff) << 24) | ((val & 0xff00) << 8) |
-           ((val & 0xff0000ULL) >> 8) | ((val & 0xff000000ULL) >> 24);
+           ((val & 0xff0000) >> 8) | ((val & 0xff000000) >> 24);
   }
 }