diff --git a/sign.sh b/sign.sh
index b072fbf5e..e4db8907b 100755
--- a/sign.sh
+++ b/sign.sh
@@ -18,6 +18,7 @@ stty -echo
 jarsigner -verbose -keystore $ANDROID_KEYSTORE_FILE -sigalg MD5withRSA -digestalg SHA1 Signed.apk $ANDROID_KEYSTORE_ALIAS || exit 1
 stty echo
 echo
+rm -f MainActivity-debug.apk
 zipalign 4 Signed.apk MainActivity-debug.apk
 rm -f Signed.apk