diff --git a/optimize.sh b/optimize.sh
index e600a145..f598c357 100755
--- a/optimize.sh
+++ b/optimize.sh
@@ -2,8 +2,14 @@
 
 set -e
 
+catchlarger() {
+    if [ "$?" != "98" ];then
+        exit $?
+    fi
+}
+
 for i in $(find -type f -name '*.png');do
-    pngquant "$i" -o "$i-optimized"
+    pngquant -o "$i-optimized" --skip-if-larger -- "$i" || catchlarger
     if [ -e "$i-optimized" ];then
         rm -f "$i"
         mv "$i-optimized" "$i"