diff --git a/db/compaction/compaction_iterator_test.cc b/db/compaction/compaction_iterator_test.cc
index ddda79a4c..94f297961 100644
--- a/db/compaction/compaction_iterator_test.cc
+++ b/db/compaction/compaction_iterator_test.cc
@@ -184,7 +184,7 @@ class TestSnapshotChecker : public SnapshotChecker {
  public:
   explicit TestSnapshotChecker(
       SequenceNumber last_committed_sequence,
-      const std::unordered_map<SequenceNumber, SequenceNumber>& snapshots = {})
+      const std::unordered_map<SequenceNumber, SequenceNumber>& snapshots = {{}})
       : last_committed_sequence_(last_committed_sequence),
         snapshots_(snapshots) {}
 
diff --git a/util/filter_bench.cc b/util/filter_bench.cc
index 9dc2ed436..6ff496cb1 100644
--- a/util/filter_bench.cc
+++ b/util/filter_bench.cc
@@ -606,7 +606,7 @@ double FilterBench::RandomQueryTest(uint32_t inside_threshold, bool dry_run,
   }
 
   if (!dry_run) {
-    fp_rate_report_ = std::ostringstream();
+    fp_rate_report_.str("");
     uint64_t q = 0;
     uint64_t fp = 0;
     double worst_fp_rate = 0.0;