diff --git a/runtime.c b/runtime.c
index 50d62e8..d4e262c 100644
--- a/runtime.c
+++ b/runtime.c
@@ -347,7 +347,7 @@ const char *class_getIvarLayout(Class cls)
 
 const char * class_getName(Class cls)
 {
-	CHECK_ARG(cls);
+	if (Nil == cls) { return "nil"; }
 	return cls->name;
 }