diff --git a/middleware/util.go b/middleware/util.go
index 09428eb0b..6550341e8 100644
--- a/middleware/util.go
+++ b/middleware/util.go
@@ -57,7 +57,7 @@ func matchSubdomain(domain, pattern string) bool {
 			return false
 		}
 	}
-	return false
+	return len(domComp) == len(patComp)
 }
 
 // https://tip.golang.org/doc/go1.19#:~:text=Read%20no%20longer%20buffers%20random%20data%20obtained%20from%20the%20operating%20system%20between%20calls
diff --git a/middleware/util_test.go b/middleware/util_test.go
index b54f12627..5d70abc44 100644
--- a/middleware/util_test.go
+++ b/middleware/util_test.go
@@ -47,6 +47,16 @@ func Test_matchSubdomain(t *testing.T) {
 		domain, pattern string
 		expected        bool
 	}{
+		{
+			domain:   "http://example.com",
+			pattern:  "http://example.com",
+			expected: true,
+		},
+		{
+			domain:   "http://example.com",
+			pattern:  "https://example.com",
+			expected: false,
+		},
 		{
 			domain:   "http://aaa.example.com",
 			pattern:  "http://*.example.com",