diff --git a/EventFiltering/PWGHF/HFFilter.cxx b/EventFiltering/PWGHF/HFFilter.cxx
index 65cbafb6a30..fa32ea04cd5 100644
--- a/EventFiltering/PWGHF/HFFilter.cxx
+++ b/EventFiltering/PWGHF/HFFilter.cxx
@@ -859,7 +859,7 @@ struct HfFilter { // Main struct for HF triggers
         continue;
       }
 
-      if (!std::accumulate(isCharmTagged.begin(), isCharmTagged.end(), 0)) {
+      if (std::accumulate(isCharmTagged.begin(), isCharmTagged.end(), 0)) {
         n3Prongs++;
       } // end multiple 3-prong selection