diff --git a/data/bin/install-wifi-firmwares.sh b/data/bin/install-wifi-firmwares.sh
index 414ccf9009..97534ef3c1 100755
--- a/data/bin/install-wifi-firmwares.sh
+++ b/data/bin/install-wifi-firmwares.sh
@@ -223,15 +223,17 @@ function InstallBroadcom43xx()
 	PreFirmwareInstallation
 
 	BuildBroadcomFWCutter
-	if [ $? -gt 0 ] ; then
+	returnCode=$?
+	if [ $returnCode -gt 0 ] ; then
 		echo "...failed. ${driver}'s firmware will not be installed."
-		return $?
+		return $returnCode
 	fi
 
 	CutAndInstallBroadcomFirmware
-	if [ $? -gt 0 ] ; then
+	returnCode=$?
+	if [ $returnCode -gt 0 ] ; then
 		echo "...failed. ${driver}'s firmware will not be installed."
-		return $?
+		return $returnCode
 	fi
 
 	PostFirmwareInstallation