diff --git a/src/config/Data.cxx b/src/config/Data.cxx
index ae36b7f21..4aae9f7dc 100644
--- a/src/config/Data.cxx
+++ b/src/config/Data.cxx
@@ -24,7 +24,8 @@
 void
 ConfigData::Clear()
 {
-	for (auto i : params)
+	for (auto &i : params) {
 		delete i;
-	params.fill(nullptr);
+		i = nullptr;
+	}
 }