diff --git a/scripts/compress-js b/scripts/compress-js
index 064652750..ea43782ea 100755
--- a/scripts/compress-js
+++ b/scripts/compress-js
@@ -1,7 +1,9 @@
 #!/bin/sh
 
+set -e
+
 for file in `find js -name '*.js' -not -name '*min.js'` ; do
     mkdir -p sources/`dirname $file`
     mv $file sources/$file
-    java -jar ./scripts/google-javascript-compiler/compiler.jar --js sources/$file --js_output_file $file --compilation_level ADVANCED_OPTIMIZATIONS
+    java -jar ./scripts/google-javascript-compiler/compiler.jar --js sources/$file --js_output_file $file
 done