1 files changed, 1 insertions, 1 deletions
diff --git a/predicate.h b/predicate.h
index c9ceb7ae..624d3d65 100644
--- a/predicate.h
+++ b/predicate.h
@@ -59,7 +59,7 @@ public:
     TRACE_DTOR(item_predicate);
   }
 
-  bool operator()(T& item) const {
+  bool operator()(T& item) {
     return ! predicate || predicate.calc(item).strip_annotations();
   }
 };