1 files changed, 3 insertions, 1 deletions
diff --git a/tests/make_png/make_sprite.c b/tests/make_png/make_sprite.c
index 5ae7bc8dd..ceb95b5ca 100644
--- a/tests/make_png/make_sprite.c
+++ b/tests/make_png/make_sprite.c
@@ -448,6 +448,8 @@ int main(int argc, char const *argv[])
         test_png = Append_Columns(test_png, base_png);
       }
 
+      pixel_diff += Image_Diff( base_png, test_png);
+
       Add_effect( base_png, test_png, after_effect_1, 1);
       pixel_diff = Add_effect( base_png, test_png, after_effect_2,2);
 
@@ -505,4 +507,4 @@ int main(int argc, char const *argv[])
   dlclose(test_handle);
 
   return 0;
-}
-\ No newline at end of file
+}