diff --git a/src/test/kc/invalid-consttype.kc b/src/test/kc/invalid-consttype.kc
index 3fcef26c4..fb4c21b72 100644
--- a/src/test/kc/invalid-consttype.kc
+++ b/src/test/kc/invalid-consttype.kc
@@ -1,5 +1,5 @@
 void main() {
-    signed byte b = -127-127;
+    signed byte b = -400;
     byte* SCREEN = $0400;
     *SCREEN = (byte)b;
 }
\ No newline at end of file