diff --git a/modules/caddytls/export_test.go b/modules/caddytls/export_test.go
index e969ee63d..d13431f4e 100644
--- a/modules/caddytls/export_test.go
+++ b/modules/caddytls/export_test.go
@@ -3,8 +3,6 @@ package caddytls
 // IsManaging returns true if the name is being managed by this TLS app.
 // This is for testing purposes only.
 func (t *TLS) IsManaging(name string) bool {
-	t.serverNamesMu.Lock()
-	defer t.serverNamesMu.Unlock()
 	_, ok := t.managing[name]
 	return ok
 }