diff --git a/octoprint_deploy.sh b/octoprint_deploy.sh
index 224bdac..f7bb02c 100755
--- a/octoprint_deploy.sh
+++ b/octoprint_deploy.sh
@@ -375,7 +375,7 @@ write_camera() {
         echo SUBSYSTEM==\"video4linux\",KERNELS==\"$USBCAM\", SUBSYSTEMS==\"usb\", ATTR{index}==\"0\", DRIVERS==\"uvcvideo\", SYMLINK+=\"cam${INUM}_$INSTANCE\" >> /etc/udev/rules.d/99-octoprint.rules
     fi
     
-    if [ -n $CAMHAPROXY ]; then
+    if [ -n "$CAMHAPROXY" ]; then
         HAversion=$(haproxy -v | sed -n 's/^.*version \([0-9]\).*/\1/p')
         #find frontend line, do insert
         sed -i "/option forwardfor except 127.0.0.1/a\        use_backend cam${INUM}_$INSTANCE if { path_beg /cam${INUM}_$INSTANCE/ }" /etc/haproxy/haproxy.cfg