diff --git a/tools/build-ega-mp4.sh b/tools/build-ega-mp4.sh
index 1f3fccd..e0edeab 100755
--- a/tools/build-ega-mp4.sh
+++ b/tools/build-ega-mp4.sh
@@ -14,6 +14,9 @@ fi
 echo "[$SEQ] going EGA" | tee -a WS/log
 
 debut=$(date +%s)
+
+rm spool/EGA/*.png
+
 for source in $(ls -1 frames/$SEQ/*.png)
 do
 	bname=$( basename $source )