diff --git a/quic/core/http/end_to_end_test.cc b/quic/core/http/end_to_end_test.cc
index 6d579f5..0557b2b 100644
--- a/quic/core/http/end_to_end_test.cc
+++ b/quic/core/http/end_to_end_test.cc
@@ -2245,17 +2245,10 @@
         client_sent_packet_manager->GetRttStats()->smoothed_rtt().IsInfinite());
     const RttStats* server_rtt_stats =
         server_sent_packet_manager->GetRttStats();
-    if (GetQuicReloadableFlag(quic_cap_large_client_initial_rtt)) {
-      EXPECT_EQ(static_cast<int64_t>(1 * kNumMicrosPerSecond),
-                server_rtt_stats->initial_rtt().ToMicroseconds());
-      EXPECT_GE(static_cast<int64_t>(1 * kNumMicrosPerSecond),
-                server_rtt_stats->smoothed_rtt().ToMicroseconds());
-    } else {
-      EXPECT_EQ(static_cast<int64_t>(kMaxInitialRoundTripTimeUs),
-                server_rtt_stats->initial_rtt().ToMicroseconds());
-      EXPECT_GE(static_cast<int64_t>(kMaxInitialRoundTripTimeUs),
-                server_rtt_stats->smoothed_rtt().ToMicroseconds());
-    }
+    EXPECT_EQ(static_cast<int64_t>(kMaxInitialRoundTripTimeUs),
+              server_rtt_stats->initial_rtt().ToMicroseconds());
+    EXPECT_GE(static_cast<int64_t>(kMaxInitialRoundTripTimeUs),
+              server_rtt_stats->smoothed_rtt().ToMicroseconds());
   } else {
     ADD_FAILURE() << "Missing sent packet manager";
   }
diff --git a/quic/core/quic_constants.h b/quic/core/quic_constants.h
index 01ec240..62c0e77 100644
--- a/quic/core/quic_constants.h
+++ b/quic/core/quic_constants.h
@@ -89,8 +89,8 @@
 // Don't allow a client to suggest an RTT shorter than 10ms.
 const uint32_t kMinInitialRoundTripTimeUs = 10 * kNumMicrosPerMilli;
 
-// Don't allow a client to suggest an RTT longer than 15 seconds.
-const uint32_t kMaxInitialRoundTripTimeUs = 15 * kNumMicrosPerSecond;
+// Don't allow a client to suggest an RTT longer than 1 second.
+const uint32_t kMaxInitialRoundTripTimeUs = kNumMicrosPerSecond;
 
 // Maximum number of open streams per connection.
 const size_t kDefaultMaxStreamsPerConnection = 100;
diff --git a/quic/core/quic_sent_packet_manager.cc b/quic/core/quic_sent_packet_manager.cc
index 01e2840..ace8d8d 100644
--- a/quic/core/quic_sent_packet_manager.cc
+++ b/quic/core/quic_sent_packet_manager.cc
@@ -1575,11 +1575,6 @@
       QuicTime::Delta::FromMicroseconds(kMinInitialRoundTripTimeUs);
   QuicTime::Delta max_rtt =
       QuicTime::Delta::FromMicroseconds(kMaxInitialRoundTripTimeUs);
-  if (GetQuicReloadableFlag(quic_cap_large_client_initial_rtt)) {
-    // TODO(fayang): change the value of kMaxInitialRoundTripTimeUs when
-    // deprecating quic_cap_large_client_initial_rtt.
-    max_rtt = QuicTime::Delta::FromSeconds(1);
-  }
   rtt_stats_.set_initial_rtt(std::max(min_rtt, std::min(max_rtt, rtt)));
 }