diff --git a/deploy/k01/apply-infra.sh b/deploy/k01/apply-infra.sh
index 0e8f8b7..1b71551 100755
--- a/deploy/k01/apply-infra.sh
+++ b/deploy/k01/apply-infra.sh
@@ -11,7 +11,7 @@ apply_docs() {
 	while IFS= read -r line; do
 		if [[ "$line" == "---" ]]; then
 			printf '%s\n' "$buf" | kubectl apply -f -
-			((i++))
+			i=$((i+1))
 			echo "  ($i) applied"
 			buf=""
 		else
@@ -20,7 +20,7 @@ apply_docs() {
 		fi
 	done < "$file"
 	printf '%s\n' "$buf" | kubectl apply -f -
-	((i++))
+	i=$((i+1))
 	echo "  ($i) applied"
 
 	if [ -n "$kind" ]; then