diff --git a/quiche/quic/core/crypto/crypto_protocol.h b/quiche/quic/core/crypto/crypto_protocol.h
index 5b3cdfb..3bbc614 100644
--- a/quiche/quic/core/crypto/crypto_protocol.h
+++ b/quiche/quic/core/crypto/crypto_protocol.h
@@ -78,7 +78,7 @@
                                                  // of stream flow control
                                                  // receive window to
                                                  // 512KB. (2^9 KB).
-const QuicTag kIFWA = TAG('I', 'F', 'W', 'a');   // Set initial size
+const QuicTag kIFWa = TAG('I', 'F', 'W', 'a');   // Set initial size
                                                  // of stream flow control
                                                  // receive window to
                                                  // 1MB. (2^0xa KB).
diff --git a/quiche/quic/core/http/end_to_end_test.cc b/quiche/quic/core/http/end_to_end_test.cc
index b6321d2..05715e8 100644
--- a/quiche/quic/core/http/end_to_end_test.cc
+++ b/quiche/quic/core/http/end_to_end_test.cc
@@ -3994,7 +3994,7 @@
   // Bump the window.
   const uint32_t kExpectedStreamIFCW = 1024 * 1024;
   const uint32_t kExpectedSessionIFCW = 1.5 * 1024 * 1024;
-  client_extra_copts_.push_back(kIFWA);
+  client_extra_copts_.push_back(kIFWa);
 
   ASSERT_TRUE(Initialize());
 
diff --git a/quiche/quic/core/quic_session.cc b/quiche/quic/core/quic_session.cc
index 829d7f1..bde478f 100644
--- a/quiche/quic/core/quic_session.cc
+++ b/quiche/quic/core/quic_session.cc
@@ -1422,7 +1422,7 @@
       if (ContainsQuicTag(config_.ReceivedConnectionOptions(), kIFW9)) {
         AdjustInitialFlowControlWindows(512 * 1024);
       }
-      if (ContainsQuicTag(config_.ReceivedConnectionOptions(), kIFWA)) {
+      if (ContainsQuicTag(config_.ReceivedConnectionOptions(), kIFWa)) {
         AdjustInitialFlowControlWindows(1024 * 1024);
       }
     }