diff --git a/quic/state/QuicStateFunctions.cpp b/quic/state/QuicStateFunctions.cpp
index d3d640319..eee5c4de2 100644
--- a/quic/state/QuicStateFunctions.cpp
+++ b/quic/state/QuicStateFunctions.cpp
@@ -366,4 +366,38 @@ uint64_t maximumConnectionIdsToIssue(const QuicConnectionStateBase& conn) {
   return maximumIdsToIssue;
 }
 
+uint64_t updateLargestReceivedPacketNum(
+    AckState& ackState,
+    PacketNum packetNum,
+    TimePoint receivedTime) {
+  PacketNum expectedNextPacket = 0;
+  if (ackState.largestRecvdPacketNum) {
+    expectedNextPacket = *ackState.largestRecvdPacketNum + 1;
+  }
+  ackState.largestRecvdPacketNum = std::max<PacketNum>(
+      ackState.largestRecvdPacketNum.value_or(packetNum), packetNum);
+  ackState.acks.insert(packetNum);
+  if (ackState.largestRecvdPacketNum == packetNum) {
+    ackState.largestRecvdPacketTime = receivedTime;
+  }
+  static_assert(Clock::is_steady, "Needs steady clock");
+
+  ackState.lastRecvdPacketInfo.assign({packetNum, receivedTime});
+
+  if (packetNum >= expectedNextPacket) {
+    if (ackState.recvdPacketInfos.size() == kMaxReceivedPktsTimestampsStored) {
+      ackState.recvdPacketInfos.pop_front();
+    }
+    ackState.recvdPacketInfos.emplace_back(
+        RecvdPacketInfo{packetNum, receivedTime});
+  }
+
+  if (expectedNextPacket) {
+    return (packetNum > expectedNextPacket) ? packetNum - expectedNextPacket
+                                            : expectedNextPacket - packetNum;
+  } else {
+    return 0;
+  }
+}
+
 } // namespace quic
diff --git a/quic/state/QuicStateFunctions.h b/quic/state/QuicStateFunctions.h
index d055aa522..a293c7568 100644
--- a/quic/state/QuicStateFunctions.h
+++ b/quic/state/QuicStateFunctions.h
@@ -59,40 +59,10 @@ void increaseNextPacketNum(
  * Update largestReceivedPacketNum in ackState with packetNum. Return the
  * distance from the next packet number we expect to receive.
  */
-template <typename ClockType = quic::Clock>
 uint64_t updateLargestReceivedPacketNum(
     AckState& ackState,
     PacketNum packetNum,
-    TimePoint receivedTime) {
-  PacketNum expectedNextPacket = 0;
-  if (ackState.largestRecvdPacketNum) {
-    expectedNextPacket = *ackState.largestRecvdPacketNum + 1;
-  }
-  ackState.largestRecvdPacketNum = std::max<PacketNum>(
-      ackState.largestRecvdPacketNum.value_or(packetNum), packetNum);
-  ackState.acks.insert(packetNum);
-  if (ackState.largestRecvdPacketNum == packetNum) {
-    ackState.largestRecvdPacketTime = receivedTime;
-  }
-  static_assert(ClockType::is_steady, "Needs steady clock");
-
-  ackState.lastRecvdPacketInfo.assign({packetNum, receivedTime});
-
-  if (packetNum >= expectedNextPacket) {
-    if (ackState.recvdPacketInfos.size() == kMaxReceivedPktsTimestampsStored) {
-      ackState.recvdPacketInfos.pop_front();
-    }
-    ackState.recvdPacketInfos.emplace_back(
-        RecvdPacketInfo{packetNum, receivedTime});
-  }
-
-  if (expectedNextPacket) {
-    return (packetNum > expectedNextPacket) ? packetNum - expectedNextPacket
-                                            : expectedNextPacket - packetNum;
-  } else {
-    return 0;
-  }
-}
+    TimePoint receivedTime);
 
 std::deque<OutstandingPacket>::iterator getNextOutstandingPacket(
     QuicConnectionStateBase& conn,