diff --git a/runtime/trampolines-varargs.m b/runtime/trampolines-varargs.m
index f2d6e110179a..a71ce6a55182 100644
--- a/runtime/trampolines-varargs.m
+++ b/runtime/trampolines-varargs.m
@@ -1,7 +1,3 @@
-// TODO: temp ignore to minimize diff
-#pragma clang diagnostic push
-#pragma clang diagnostic ignored "-Wsign-conversion"
-
 #if !defined (__i386__) && !defined (__x86_64__) && !(defined (__arm64__) && !defined(__ILP32__))
 #define __VARARGS_TRAMPOLINES__ 1
 #endif
@@ -132,7 +128,7 @@
 	case _C_ULNG:
 	case _C_LNG_LNG:
 	case _C_ULNG_LNG:
-		state->longlong_ret = *(uint64_t *) mono_object_unbox (value);
+		state->longlong_ret = *(int64_t *) mono_object_unbox (value);
 		break;
 	
 	// For pointer types we get the value itself.
@@ -323,6 +319,4 @@
 	va_end (state.ap);
 }
 
-#endif /* __VARARGS_TRAMPOLINES__ */
-
-#pragma clang diagnostic pop
+#endif /* __VARARGS_TRAMPOLINES__ */
\ No newline at end of file