diff --git a/sdks/unreal/src/SpacetimeDbSdk/Source/SpacetimeDbSdk/Public/Types/Builtins.h b/sdks/unreal/src/SpacetimeDbSdk/Source/SpacetimeDbSdk/Public/Types/Builtins.h
index ff0bf8b1441..54a7049df0c 100644
--- a/sdks/unreal/src/SpacetimeDbSdk/Source/SpacetimeDbSdk/Public/Types/Builtins.h
+++ b/sdks/unreal/src/SpacetimeDbSdk/Source/SpacetimeDbSdk/Public/Types/Builtins.h
@@ -8,7 +8,14 @@
 #include "Kismet/BlueprintFunctionLibrary.h"
 #include "Builtins.generated.h"
 
-
+// macOS/Objective-C++ defines Nil as a macro (#define Nil nullptr in objc/objc.h).
+// Unreal Engine compiles as Objective-C++ on Apple platforms, causing FSpacetimeDBUuid::Nil()
+// to fail with "expected member name or ';' after declaration specifiers".
+#ifdef Nil
+#define SPACETIMEDB_NIL_MACRO_SAVED
+#pragma push_macro("Nil")
+#undef Nil
+#endif
 
 /**Compression algorithms supported by SpacetimeDB for data storage and transmission. */
 UENUM(BlueprintType)
@@ -1081,4 +1088,10 @@ class SPACETIMEDBSDK_API USpacetimeDBUuidLibrary : public UBlueprintFunctionLibr
     {
         return FSpacetimeDBUuid(Guid);
     }
-};
\ No newline at end of file
+};
+
+// Restore macOS/Objective-C++ Nil macro
+#ifdef SPACETIMEDB_NIL_MACRO_SAVED
+#pragma pop_macro("Nil")
+#undef SPACETIMEDB_NIL_MACRO_SAVED
+#endif
\ No newline at end of file