diff --git a/src/quic/data.h b/src/quic/data.h
index f6a741922ad6c5..2ccd7d7a8156f2 100644
--- a/src/quic/data.h
+++ b/src/quic/data.h
@@ -129,7 +129,7 @@ class QuicError final : public MemoryRetainer {
   const uint8_t* reason_c_str() const;
 
   std::string reason_;
-  ngtcp2_connection_close_error error_;
+  ngtcp2_connection_close_error error_ = ngtcp2_connection_close_error();
   const ngtcp2_connection_close_error* ptr_ = nullptr;
 };