diff --git a/lib/tempest b/lib/tempest
index 3c37918..350d08c 100644
--- a/lib/tempest
+++ b/lib/tempest
@@ -372,7 +372,7 @@
     fi
 
     if [ $TEMPEST_VOLUME_DRIVER != "default" -o \
-        $TEMPEST_VOLUME_VENDOR != $TEMPEST_DEFAULT_VOLUME_VENDOR ]; then
+        "$TEMPEST_VOLUME_VENDOR" != "$TEMPEST_DEFAULT_VOLUME_VENDOR" ]; then
         iniset $TEMPEST_CONFIG volume vendor_name "$TEMPEST_VOLUME_VENDOR"
     fi
     if [ $TEMPEST_VOLUME_DRIVER != "default" -o \