Fix forward declaration.

1 files changed, 1 insertions, 1 deletions

diff --git a/searchcore/src/vespa/searchcore/proton/matching/extract_features.h b/searchcore/src/vespa/searchcore/proton/matching/extract_features.h
index 66e98d9db2d..3c0f60b5b3f 100644
--- a/searchcore/src/vespa/searchcore/proton/matching/extract_features.h
+++ b/searchcore/src/vespa/searchcore/proton/matching/extract_features.h
@@ -5,7 +5,7 @@
 #include <vespa/searchlib/common/featureset.h>
 #include <vector>
 
-namespace vespalib { class ThreadBundle; };
+namespace vespalib { struct ThreadBundle; };
 namespace search::queryeval { class SearchIterator; }
 namespace search::fef { class RankProgram; }