diff --git a/common/config b/common/config
index 71798f0a..8844173f 100644
--- a/common/config
+++ b/common/config
@@ -532,6 +532,10 @@ _overlay_config_override()
 	# Store original base fs vars
 	export OVL_BASE_TEST_DEV="$TEST_DEV"
 	export OVL_BASE_TEST_DIR="$TEST_DIR"
+	# If config does not set MOUNT_OPTIONS, its value may be
+	# leftover from previous _overlay_config_override, so
+	# don't use that value for base fs mount
+	[ "$MOUNT_OPTIONS" != "$OVERLAY_MOUNT_OPTIONS" ] || unset MOUNT_OPTIONS
 	export OVL_BASE_MOUNT_OPTIONS="$MOUNT_OPTIONS"
 
 	# Set TEST vars to overlay base and mount dirs inside base fs