diff --git a/imagick/magick_wand_test.go b/imagick/magick_wand_test.go
index 082836b..09ee59c 100644
--- a/imagick/magick_wand_test.go
+++ b/imagick/magick_wand_test.go
@@ -235,7 +235,7 @@ func TestReadImageBlob(t *testing.T) {
 
 	// Try to read an empty wand
 	blob, _ := mw.GetImageBlob()
-	if blob != nil {
+	if len(blob) > 0 {
 		t.Fatal("Expected nil blob on invalid wand")
 	}