diff --git a/entrypoint.sh b/entrypoint.sh
index 8cabb43..32e83d1 100755
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -30,15 +30,25 @@ echo "Installing prettier..."
 case $INPUT_PRETTIER_VERSION in
     false)
         npm install --silent --global prettier
-        if [[ -n $INPUT_PRETTIER_PLUGINS ]]; then
-            npm install --silent --global $INPUT_PRETTIER_PLUGINS
-        fi
         ;;
     *)
         npm install --silent --global prettier@$INPUT_PRETTIER_VERSION
         ;;
 esac
 
+# Install plugins
+if [ -n "$INPUT_PRETTIER_PLUGINS" ]; then
+    for plugin in $INPUT_PRETTIER_PLUGINS; do
+        # check regex against @prettier/xyz
+        REGEX = '(@prettier\/)+(plugin-[a-z\-]+)'
+        if ! [ "$plugin" =~ "$REGEX" ]
+            echo "Specified plugins does not seem to be valid @prettier/x plugins."
+            exit 1
+        fi
+    done
+    npm install --silent --global $INPUT_PRETTIER_PLUGINS
+fi
+
 echo "Prettifing files..."
 echo "Files:"
 prettier $INPUT_PRETTIER_OPTIONS || echo "Problem running prettier with $INPUT_PRETTIER_OPTIONS"