diff --git a/tools/make-opera.sh b/tools/make-opera.sh
index 596b7ce82..5dd9c91e3 100755
--- a/tools/make-opera.sh
+++ b/tools/make-opera.sh
@@ -23,6 +23,13 @@ cp platform/chromium/*.html $DES/
 cp platform/chromium/*.json $DES/
 cp LICENSE.txt              $DES/
 
+echo "*** uBlock0.opera: concatenating content scripts"
+cat $DES/js/vapi-usercss.js > /tmp/contentscript.js
+echo >> /tmp/contentscript.js
+grep -v "^'use strict';$" $DES/js/contentscript.js >> /tmp/contentscript.js
+mv /tmp/contentscript.js $DES/js/contentscript.js
+rm $DES/js/vapi-usercss.js
+
 # Opera-specific
 cp platform/opera/manifest.json $DES/
 rm -r $DES/_locales/cv