diff --git a/plexupdate.sh b/plexupdate.sh
index 46b4838..fdc09da 100755
--- a/plexupdate.sh
+++ b/plexupdate.sh
@@ -211,7 +211,7 @@ SKIP_DOWNLOAD="no"
 # Installed version detection (only supported for deb based systems, feel free to submit rpm equivalent)
 if [ "${REDHAT}" != "yes" ]; then
 	INSTALLED_VERSION=$(dpkg-query -s plexmediaserver 2>/dev/null | grep -Po 'Version: \K.*')
-	if [ $FILENAME == *$INSTALLED_VERSION* ] && [ "${FORCE}" != "yes" ]; then
+	if [[ $FILENAME == *$INSTALLED_VERSION* ]] && [ "${FORCE}" != "yes" ]; then
 		echo "Your OS reports the latest version of Plex ($INSTALLED_VERSION) is already installed. Use -f to force download."
 		exit 5
 	fi