diff --git a/test/fixedbugs/bug012.go b/test/fixedbugs/bug012.go
index 7f5fd84b366..e51819ebb6b 100644
--- a/test/fixedbugs/bug012.go
+++ b/test/fixedbugs/bug012.go
@@ -12,8 +12,10 @@ func main() {
 	var u31 uint64 = 1;
 	var u32 uint64 = 18446744073709551615;
 	var u33 uint64 = +18446744073709551615;
-	if u32 != ^0 { panic "u32\n"; }
-	if u33 != ^0 { panic "u33\n"; }
+	if u32 != (1<<64)-1 { panic "u32\n"; }
+	if u33 != (1<<64)-1 { panic "u33\n"; }
+	var i34 int64 = ^0;  // note: 2's complement means ^0 == -1
+	if i34 != -1 { panic "i34" }
 }
 /*
 bug12.go:5: overflow converting constant to <uint64>UINT64