diff --git a/compatible_test.go b/compatible_test.go
index f4fa316..4a5ed22 100644
--- a/compatible_test.go
+++ b/compatible_test.go
@@ -25,7 +25,7 @@ var (
 )
 
 const (
-	imageThreshold = 25
+	imageThreshold = 40
 )
 
 func generateTestData() error {