diff --git a/plugins/marked/marked.plugin.zsh b/plugins/marked/marked.plugin.zsh
index 8c014372b..56863ade5 100644
--- a/plugins/marked/marked.plugin.zsh
+++ b/plugins/marked/marked.plugin.zsh
@@ -3,9 +3,9 @@
 # If marked is passed a file, open it in Marked
 #
 function marked() {
-    if [ $1 ]
+    if [ "$1" ]
     then
-        open -a "marked 2.app" $1
+        open -a "marked 2.app" "$1"
     else
         open -a "marked 2.app"
     fi