Trace the optimized blueprint.

1 files changed, 1 insertions, 1 deletions

diff --git a/searchlib/src/vespa/searchlib/engine/request.h b/searchlib/src/vespa/searchlib/engine/request.h
index 21087d4eff0..521a5be39fc 100644
--- a/searchlib/src/vespa/searchlib/engine/request.h
+++ b/searchlib/src/vespa/searchlib/engine/request.h
@@ -32,7 +32,7 @@ public:
     uint32_t getTraceLevel() const { return _traceLevel; }
     Request & setTraceLevel(uint32_t traceLevel) { _traceLevel = traceLevel; return *this; }
 
-    Trace & trace() { return _trace; }
+    Trace & trace() const { return _trace; }
 private:
     const fastos::TimeStamp _startTime;
     fastos::TimeStamp       _timeOfDoom;