diff --git a/setup/install_scripts/00-so-checksum-offload-disable b/setup/install_scripts/00-so-checksum-offload-disable
index 32b8d46e6..c2f449965 100755
--- a/setup/install_scripts/00-so-checksum-offload-disable
+++ b/setup/install_scripts/00-so-checksum-offload-disable
@@ -1,9 +1,9 @@
 #!/bin/bash
 
-if [ "$NM_DISPATCHER_ACTION" == "pre-up" ]; then
-    if ["$DEVICE_IFACE" !== "$MAININT"]; then
+if [[ "$NM_DISPATCHER_ACTION" == "pre-up" ]]; then
+    if [[ "$DEVICE_IFACE" != "$MAININT" ]]; then
         for i in rx tx sg tso ufo gso gro lro; do 
-            ethtool -K $DEVICE_IFACE $i off; 
+            ethtool -K "$DEVICE_IFACE" "$i" off; 
         done
     fi
 fi