diff --git a/entrypoint.sh b/entrypoint.sh
index 7d14feb..78e004c 100755
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -30,7 +30,7 @@ echo "Installing prettier..."
 case $INPUT_PRETTIER_VERSION in
     false)
         npm install --silent --global prettier
-        if [ -n $INPUT_PRETTIER_PLUGINS ]; then
+        if [ -n "$INPUT_PRETTIER_PLUGINS" ]; then
             npm install --silent --global $INPUT_PRETTIER_PLUGINS
         fi
         ;;