diff --git a/ConflictSet.cpp b/ConflictSet.cpp
index d28e568..0c6d74d 100644
--- a/ConflictSet.cpp
+++ b/ConflictSet.cpp
@@ -719,6 +719,9 @@ struct ReadContext {
   int64_t prefix_read_iterations_accum = 0;
   int64_t range_read_iterations_accum = 0;
   int64_t range_read_node_scan_accum = 0;
+  int64_t commits_accum = 0;
+  int64_t conflicts_accum = 0;
+  int64_t too_olds_accum = 0;
   ConflictSet::Impl *impl;
 };
 
@@ -3114,9 +3117,6 @@ struct __attribute__((visibility("hidden"))) ConflictSet::Impl {
   void check(const ReadRange *reads, Result *result, int count) {
     ReadContext tls;
     tls.impl = this;
-    int commits_accum = 0;
-    int conflicts_accum = 0;
-    int too_olds_accum = 0;
     int64_t check_byte_accum = 0;
     for (int i = 0; i < count; ++i) {
       const auto &r = reads[i];
@@ -3134,9 +3134,9 @@ struct __attribute__((visibility("hidden"))) ConflictSet::Impl {
                                   InternalVersionT(reads[i].readVersion), &tls))
               ? Commit
               : Conflict;
-      commits_accum += result[i] == Commit;
-      conflicts_accum += result[i] == Conflict;
-      too_olds_accum += result[i] == TooOld;
+      tls.commits_accum += result[i] == Commit;
+      tls.conflicts_accum += result[i] == Conflict;
+      tls.too_olds_accum += result[i] == TooOld;
     }
     point_read_total.add(tls.point_read_accum);
     prefix_read_total.add(tls.prefix_read_accum);
@@ -3148,9 +3148,9 @@ struct __attribute__((visibility("hidden"))) ConflictSet::Impl {
     point_read_iterations_total.add(tls.point_read_iterations_accum);
     prefix_read_iterations_total.add(tls.prefix_read_iterations_accum);
     range_read_iterations_total.add(tls.range_read_iterations_accum);
-    commits_total.add(commits_accum);
-    conflicts_total.add(conflicts_accum);
-    too_olds_total.add(too_olds_accum);
+    commits_total.add(tls.commits_accum);
+    conflicts_total.add(tls.conflicts_accum);
+    too_olds_total.add(tls.too_olds_accum);
     check_bytes_total.add(check_byte_accum);
   }