diff --git a/invid-conv b/invid-conv
index bb47644..5f5fb55 100755
--- a/invid-conv
+++ b/invid-conv
@@ -22,7 +22,7 @@
 # 3. This notice may not be removed or altered from any source
 #    distribution.
 
-YT_URL=$1
+YT_URL="$1"
 INVID_BASE="https://inv.nadeko.net"
 
 if [[ $YT_URL == *"youtu.be"* ]]
@@ -33,4 +33,4 @@ then
 	INVID_URL="${INVID_BASE}/${YT_URL##*/}"
 fi
 
-echo $INVID_URL
+echo "$INVID_URL"