diff --git a/PWGDQ/Tasks/tableReader_withAssoc.cxx b/PWGDQ/Tasks/tableReader_withAssoc.cxx
index aba3686f2e8..34eaef40c8e 100644
--- a/PWGDQ/Tasks/tableReader_withAssoc.cxx
+++ b/PWGDQ/Tasks/tableReader_withAssoc.cxx
@@ -3471,8 +3471,23 @@ struct AnalysisAsymmetricPairing {
 
     int sign1 = 0;
     int sign2 = 0;
-    ditrackList.reserve(assocs.size());
-    ditrackExtraList.reserve(assocs.size());
+
+    // Reserve capacity for the output tables
+    int64_t reserveSize = 0;
+    for (auto const& event : events) {
+      if (!event.isEventSelected_bit(0)) {
+        continue;
+      }
+      if (fConfigRemoveCollSplittingCandidates.value && event.isEventSelected_bit(2)) {
+        continue;
+      }
+      auto groupedLegAAssocs = legACandidateAssocs.sliceBy(preslice, event.globalIndex());
+      auto groupedLegBAssocs = legBCandidateAssocs.sliceBy(preslice, event.globalIndex());
+      reserveSize += static_cast<int64_t>(groupedLegAAssocs.size()) *
+                     static_cast<int64_t>(groupedLegBAssocs.size());
+    }
+    ditrackList.reserve(reserveSize);
+    ditrackExtraList.reserve(reserveSize);
 
     constexpr bool trackHasCov = ((TTrackFillMap & VarManager::ObjTypes::TrackCov) > 0 || (TTrackFillMap & VarManager::ObjTypes::ReducedTrackBarrelCov) > 0);