diff --git a/quic/core/quic_unacked_packet_map.cc b/quic/core/quic_unacked_packet_map.cc
index 92f3171..cc9c13f 100644
--- a/quic/core/quic_unacked_packet_map.cc
+++ b/quic/core/quic_unacked_packet_map.cc
@@ -35,7 +35,9 @@
       session_decides_what_to_write_(false),
       supports_multiple_packet_number_spaces_(false),
       simple_inflight_time_(GetQuicReloadableFlag(quic_simple_inflight_time)) {
-  QUIC_RELOADABLE_FLAG_COUNT(quic_simple_inflight_time);
+  if (simple_inflight_time_) {
+    QUIC_RELOADABLE_FLAG_COUNT(quic_simple_inflight_time);
+  }
 }
 
 QuicUnackedPacketMap::~QuicUnackedPacketMap() {