diff --git a/test/fuzzers/vp9_encoder_references_fuzzer.cc b/test/fuzzers/vp9_encoder_references_fuzzer.cc
index 277f308012..f083bdab51 100644
--- a/test/fuzzers/vp9_encoder_references_fuzzer.cc
+++ b/test/fuzzers/vp9_encoder_references_fuzzer.cc
@@ -143,7 +143,7 @@ class FrameValidator : public EncodedImageCallback {
   }
 
   GofInfoVP9 gof_;
-  int64_t picture_id_;
+  int64_t picture_id_ = 1;
   FrameDependenciesCalculator dependencies_calculator_;
   std::vector<LayerFrame> frames_;
 };