diff --git a/act/runner/reusable_workflow.go b/act/runner/reusable_workflow.go
index e231e39f..9ef57d20 100644
--- a/act/runner/reusable_workflow.go
+++ b/act/runner/reusable_workflow.go
@@ -240,19 +240,3 @@ func newRemoteReusableWorkflowWithPlat(url, uses string) *remoteReusableWorkflow
 		URL:         url,
 	}
 }
-
-// isSameInstance checks if two URLs/hosts refer to the same instance.
-// Normalizes protocol prefixes, trailing slashes, and case.
-func isSameInstance(urlOrHost, instance string) bool {
-	normalize := func(s string) string {
-		s = strings.TrimSpace(s)
-		s = strings.TrimSuffix(s, "/")
-		if strings.HasPrefix(s, "http://") || strings.HasPrefix(s, "https://") {
-			if u, err := url.Parse(s); err == nil && u.Host != "" {
-				return strings.ToLower(u.Host)
-			}
-		}
-		return strings.ToLower(s)
-	}
-	return normalize(urlOrHost) == normalize(instance)
-}
diff --git a/act/runner/urlutil.go b/act/runner/urlutil.go
new file mode 100644
index 00000000..e7dcbd69
--- /dev/null
+++ b/act/runner/urlutil.go
@@ -0,0 +1,23 @@
+package runner
+
+import (
+	"net/url"
+	"strings"
+)
+
+// Normalizes protocol prefixes, trailing slashes, and case.
+func normalizeHost(s string) string {
+	s = strings.TrimSpace(s)
+	s = strings.TrimSuffix(s, "/")
+	if strings.HasPrefix(s, "http://") || strings.HasPrefix(s, "https://") {
+		if u, err := url.Parse(s); err == nil && u.Host != "" {
+			return strings.ToLower(u.Host)
+		}
+	}
+	return strings.ToLower(s)
+}
+
+// isSameInstance checks if two URLs/hosts refer to the same instance.
+func isSameInstance(urlOrHost, instance string) bool {
+	return normalizeHost(urlOrHost) == normalizeHost(instance)
+}