diff --git a/.gitignore b/.gitignore
index 1b42bf6fb..e280e7cb3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -69,6 +69,7 @@ pngtest
 pngunknown
 pngvalid
 timepng
+pngout.png
 
 # Libpng CI artifacts
 out/