diff --git a/tools/chunks/catchunks/consumer.hpp b/tools/chunks/catchunks/consumer.hpp
index 3f6f77e..a2151a9 100644
--- a/tools/chunks/catchunks/consumer.hpp
+++ b/tools/chunks/catchunks/consumer.hpp
@@ -94,7 +94,7 @@
   std::ostream& m_outputStream;
   unique_ptr<DiscoverVersion> m_discover;
   unique_ptr<PipelineInterests> m_pipeline;
-  uint64_t m_nextToPrint;
+  uint64_t m_nextToPrint = 0;
 
 PUBLIC_WITH_TESTS_ELSE_PRIVATE:
   std::map<uint64_t, shared_ptr<const Data>> m_bufferedData;