diff --git a/src/wg-quick.bash b/src/wg-quick.bash
index 00f0eda..275594e 100755
--- a/src/wg-quick.bash
+++ b/src/wg-quick.bash
@@ -79,7 +79,7 @@ add_if() {
 }
 
 del_if() {
-	DEFAULT_TABLE=$(("$(wg show "$INTERFACE" fwmark)"))
+	DEFAULT_TABLE=$(( $(wg show "$INTERFACE" fwmark) ))
 	if [[ $DEFAULT_TABLE -ne 0 ]]; then
 		while [[ -n $(ip -4 rule show table $DEFAULT_TABLE) ]]; do
 			cmd ip -4 rule delete table $DEFAULT_TABLE