diff --git a/src/nfagraph/ng_literal_analysis.cpp b/src/nfagraph/ng_literal_analysis.cpp
index ea0def02..d25ac43e 100644
--- a/src/nfagraph/ng_literal_analysis.cpp
+++ b/src/nfagraph/ng_literal_analysis.cpp
@@ -69,14 +69,14 @@ struct LitGraphVertexProps {
     LitGraphVertexProps() = default;
     explicit LitGraphVertexProps(ue2_literal::elem c_in) : c(move(c_in)) {}
     ue2_literal::elem c; // string element (char + bool)
-    size_t index; // managed by ue2_graph
+    size_t index = 0; // managed by ue2_graph
 };
 
 struct LitGraphEdgeProps {
     LitGraphEdgeProps() = default;
     explicit LitGraphEdgeProps(u64a score_in) : score(score_in) {}
     u64a score = NO_LITERAL_AT_EDGE_SCORE;
-    size_t index; // managed by ue2_graph
+    size_t index = 0; // managed by ue2_graph
 };
 
 struct LitGraph
diff --git a/tools/hsbench/engine_hyperscan.h b/tools/hsbench/engine_hyperscan.h
index 253ec9aa..afbdf098 100644
--- a/tools/hsbench/engine_hyperscan.h
+++ b/tools/hsbench/engine_hyperscan.h
@@ -65,8 +65,8 @@ public:
 class EngineHSStream : public EngineStream {
 public:
     ~EngineHSStream();
-    hs_stream_t *id;
-    EngineHSContext *ctx;
+    hs_stream_t *id = nullptr;
+    EngineHSContext *ctx = nullptr;
 };
 
 /** Hyperscan Engine for scanning data. */
diff --git a/tools/hsbench/engine_pcre.h b/tools/hsbench/engine_pcre.h
index d121581f..9569bef4 100644
--- a/tools/hsbench/engine_pcre.h
+++ b/tools/hsbench/engine_pcre.h
@@ -62,7 +62,7 @@ public:
 struct PcreDB {
     bool highlander = false;
     bool utf8 = false;
-    u32 id;
+    u32 id = 0;
     pcre *db = nullptr;
     pcre_extra *extra = nullptr;
 };
diff --git a/tools/hsbench/main.cpp b/tools/hsbench/main.cpp
index 3349ecc8..1c91813b 100644
--- a/tools/hsbench/main.cpp
+++ b/tools/hsbench/main.cpp
@@ -877,6 +877,7 @@ void displayCsvResults(const vector<unique_ptr<ThreadContext>> &threads,
     printf(",\"%0.3f\"", totalSecs);
     printf(",\"%0.2Lf\"", calc_mbps(totalSecs, totalBytes));
 
+    assert(bytesPerRun);
     double matchRate = ((double)matchesPerRun * 1024) / bytesPerRun;
     printf(",\"%llu\"", matchesPerRun);
     printf(",\"%0.3f\"", matchRate);