diff --git a/traffxml/traff_decoder.cpp b/traffxml/traff_decoder.cpp
index 2db984d31..10fe48756 100644
--- a/traffxml/traff_decoder.cpp
+++ b/traffxml/traff_decoder.cpp
@@ -29,6 +29,8 @@
 
 namespace traffxml
 {
+// Only needed for OpenlrTraffDecoder, see below
+#if 0
 // Number of worker threads for the OpenLR decoder
 /*
  * TODO how to determine the best number of worker threads?
@@ -37,6 +39,7 @@ namespace traffxml
  * Otherwise there is little to be gained, as we decode messages one at a time.
  */
 auto constexpr kNumDecoderThreads = 1;
+#endif
 
 // Timeout for the router in seconds, used by RoutingTraffDecoder
 // TODO set to a sensible value
diff --git a/traffxml/traff_decoder.hpp b/traffxml/traff_decoder.hpp
index 6189aea8b..5cfe044a9 100644
--- a/traffxml/traff_decoder.hpp
+++ b/traffxml/traff_decoder.hpp
@@ -41,6 +41,8 @@ public:
                const CountryParentNameGetterFn & countryParentNameGetter,
                std::map<std::string, traffxml::TraffMessage> & messageCache);
 
+  virtual ~TraffDecoder() {}
+
   /**
    * @brief Decodes a single message to its segments and their speed groups.
    *
diff --git a/traffxml/traff_model_xml.cpp b/traffxml/traff_model_xml.cpp
index 50e022064..bc31b346b 100644
--- a/traffxml/traff_model_xml.cpp
+++ b/traffxml/traff_model_xml.cpp
@@ -826,8 +826,9 @@ bool SegmentFromXml(pugi::xml_node const & node,
                std::map<traffic::TrafficInfo::RoadSegmentId, traffic::SpeedGroup> & coloring)
 {
   uint32_t fid;
-  uint16_t idx;
-  uint8_t dir;
+  // initialize to get rid of compiler warnings (which are false alerts)
+  uint16_t idx = 0;
+  uint8_t dir = 0;
   if (IntegerFromXml(node.attribute("fid"), fid)
       && IntegerFromXml(node.attribute("idx"), idx)
       && IntegerFromXml(node.attribute("dir"), dir))
diff --git a/traffxml/traff_source.hpp b/traffxml/traff_source.hpp
index 27aa836d3..b93d15a86 100644
--- a/traffxml/traff_source.hpp
+++ b/traffxml/traff_source.hpp
@@ -26,6 +26,8 @@ class TraffSource;
 class TraffSourceManager
 {
 public:
+  virtual ~TraffSourceManager() {}
+
   /**
    * @brief Retrieves all currently active MWMs.
    *