diff --git a/src/ui/FrameScript.cpp b/src/ui/FrameScript.cpp
index 5afa30d..3debce6 100644
--- a/src/ui/FrameScript.cpp
+++ b/src/ui/FrameScript.cpp
@@ -247,7 +247,7 @@ void FrameScript_Execute(int32_t function, FrameScript_Object* objectThis, int32
 
     static char argName[] = { 'a', 'r', 'g', '0', 0, 0, 0 };
 
-    int32_t firstArg = event != 0;
+    int32_t firstArg = event ? 1 : 0;
     int32_t argId = 0;
 
     if (firstArg < argCount) {