diff --git a/codegen/luau/runtime/runtime.lua b/codegen/luau/runtime/runtime.lua
index 6d137e9..d1dc423 100644
--- a/codegen/luau/runtime/runtime.lua
+++ b/codegen/luau/runtime/runtime.lua
@@ -736,7 +736,7 @@ do
 		local new = old + num
 
 		if new > memory.max then
-			return -1
+			return to_u32(-1)
 		else
 			memory.min = new