1 files changed, 2 insertions, 0 deletions
diff --git a/searchcore/src/vespa/searchcore/proton/metrics/metrics_engine.h b/searchcore/src/vespa/searchcore/proton/metrics/metrics_engine.h
index f90f8205817..06d76d1d8d7 100644
--- a/searchcore/src/vespa/searchcore/proton/metrics/metrics_engine.h
+++ b/searchcore/src/vespa/searchcore/proton/metrics/metrics_engine.h
@@ -4,8 +4,10 @@
 
 #include "metricswireservice.h"
 #include <vespa/metrics/state_api_adapter.h>
+#include <memory>
 
 namespace metrics {
+    class Metric;
     class Metricmanager;
     class UpdateHook;
 }