diff --git a/drydocker/roundcubemail-plugins-kolab/test_jslint.sh b/drydocker/roundcubemail-plugins-kolab/test_jslint.sh
new file mode 100755
--- /dev/null
+++ b/drydocker/roundcubemail-plugins-kolab/test_jslint.sh
@@ -0,0 +1,29 @@
+#!/bin/bash
+
+pushd /srv/${PACKAGE}.git
+
+wget http://dl.google.com/closure-compiler/compiler-latest.zip -O compiler.zip || (echo "Failed to download the closure-compiler" ; exit 1)
+unzip -u compiler.zip
+
+retval=0
+
+find ./plugins -type f -name "*.js" | grep -v '.min' | grep -v 'viewer/' | sort | while read file; do
+    echo "Linting '$file' ..."
+    java -jar ./compiler.jar --language_in="ECMASCRIPT3" $file > /dev/null
+    rval=$?
+    if [ ${rval} -ne 0 ]; then
+        echo "> FAILED"
+    else
+        echo "> OK"
+    fi
+    retval=$(( ${retval} + $rval ))
+done
+
+rm -f ./compiler.jar ./compiler.zip ./README* ./COPYING
+
+if [ ${retval} -ne 0 ]; then
+    echo "FAILED jslint test."
+    exit 1
+fi
+
+popd