diff --git a/internal/docker/helpers.go b/internal/docker/helpers.go
index 360a82b..ea8104f 100644
--- a/internal/docker/helpers.go
+++ b/internal/docker/helpers.go
@@ -40,9 +40,5 @@ func randomID(length int) (string, error) {
 // cutLast splits s around the last occurrence of sep, like strings.Cut but
 // from the right.
 func cutLast(s, sep string) (before, after string, found bool) {
-	i := strings.LastIndex(s, sep)
-	if i < 0 {
-		return s, "", false
-	}
-	return s[:i], s[i+len(sep):], true
+	return strings.CutLast(s, sep)
 }