diff --git a/rtc_base/async_udp_socket.cc b/rtc_base/async_udp_socket.cc
index 7e4b9378f6..7276a230b9 100644
--- a/rtc_base/async_udp_socket.cc
+++ b/rtc_base/async_udp_socket.cc
@@ -23,10 +23,10 @@
 
 namespace rtc {
 
-// Returns true if the the client is in the experiment to get timestamps
-// from the socket implementation.
-static bool IsScmTimeStampExperimentEnabled() {
-  return webrtc::field_trial::IsEnabled("WebRTC-SCM-Timestamp");
+// Returns true if the experiement "WebRTC-SCM-Timestamp" is explicitly
+// disabled.
+static bool IsScmTimeStampExperimentDisabled() {
+  return webrtc::field_trial::IsDisabled("WebRTC-SCM-Timestamp");
 }
 
 AsyncUDPSocket* AsyncUDPSocket::Create(Socket* socket,
@@ -133,7 +133,7 @@ void AsyncUDPSocket::OnReadEvent(Socket* socket) {
   } else {
     if (!socket_time_offset_) {
       socket_time_offset_ =
-          IsScmTimeStampExperimentEnabled() ? TimeMicros() - timestamp : 0;
+          !IsScmTimeStampExperimentDisabled() ? TimeMicros() - timestamp : 0;
     }
     timestamp += *socket_time_offset_;
   }
diff --git a/rtc_base/physical_socket_server.cc b/rtc_base/physical_socket_server.cc
index be7d9680e4..d42168249a 100644
--- a/rtc_base/physical_socket_server.cc
+++ b/rtc_base/physical_socket_server.cc
@@ -122,10 +122,10 @@ class ScopedSetTrue {
   bool* value_;
 };
 
-// Returns true if the the client is in the experiment to get timestamps
-// from the socket implementation.
-bool IsScmTimeStampExperimentEnabled() {
-  return webrtc::field_trial::IsEnabled("WebRTC-SCM-Timestamp");
+// Returns true if the experiement "WebRTC-SCM-Timestamp" is explicitly
+// disabled.
+bool IsScmTimeStampExperimentDisabled() {
+  return webrtc::field_trial::IsDisabled("WebRTC-SCM-Timestamp");
 }
 }  // namespace
 
@@ -137,7 +137,7 @@ PhysicalSocket::PhysicalSocket(PhysicalSocketServer* ss, SOCKET s)
       error_(0),
       state_((s == INVALID_SOCKET) ? CS_CLOSED : CS_CONNECTED),
       resolver_(nullptr),
-      read_scm_timestamp_experiment_(IsScmTimeStampExperimentEnabled()) {
+      read_scm_timestamp_experiment_(!IsScmTimeStampExperimentDisabled()) {
   if (s_ != INVALID_SOCKET) {
     SetEnabledEvents(DE_READ | DE_WRITE);
 
@@ -720,7 +720,7 @@ bool SocketDispatcher::Initialize() {
   ioctlsocket(s_, FIONBIO, &argp);
 #elif defined(WEBRTC_POSIX)
   fcntl(s_, F_SETFL, fcntl(s_, F_GETFL, 0) | O_NONBLOCK);
-  if (IsScmTimeStampExperimentEnabled()) {
+  if (!IsScmTimeStampExperimentDisabled()) {
     int value = 1;
     // Attempt to get receive packet timestamp from the socket.
     if (::setsockopt(s_, SOL_SOCKET, SO_TIMESTAMP, &value, sizeof(value)) !=
diff --git a/rtc_base/physical_socket_server_unittest.cc b/rtc_base/physical_socket_server_unittest.cc
index ba8ac85e6c..f24c7e46ce 100644
--- a/rtc_base/physical_socket_server_unittest.cc
+++ b/rtc_base/physical_socket_server_unittest.cc
@@ -461,9 +461,6 @@ TEST_F(PhysicalSocketTest, TestGetSetOptionsIPv6) {
 
 #if defined(WEBRTC_POSIX)
 
-#if !defined(WEBRTC_MAC)
-// We don't get recv timestamps on Mac without the experiment
-// WebRTC-SCM-Timestamp
 TEST_F(PhysicalSocketTest, TestSocketRecvTimestampIPv4) {
   MAYBE_SKIP_IPV4;
   SocketTest::TestSocketRecvTimestampIPv4();
@@ -472,18 +469,19 @@ TEST_F(PhysicalSocketTest, TestSocketRecvTimestampIPv4) {
 TEST_F(PhysicalSocketTest, TestSocketRecvTimestampIPv6) {
   SocketTest::TestSocketRecvTimestampIPv6();
 }
-#endif
 
-TEST_F(PhysicalSocketTest, TestSocketRecvTimestampIPv4ScmExperiment) {
+#if !defined(WEBRTC_MAC)
+TEST_F(PhysicalSocketTest, TestSocketRecvTimestampIPv4ScmExperimentDisabled) {
   MAYBE_SKIP_IPV4;
-  webrtc::test::ScopedFieldTrials trial("WebRTC-SCM-Timestamp/Enabled/");
+  webrtc::test::ScopedFieldTrials trial("WebRTC-SCM-Timestamp/Disabled/");
   SocketTest::TestSocketRecvTimestampIPv4();
 }
 
-TEST_F(PhysicalSocketTest, TestSocketRecvTimestampIPv6ScmExperiment) {
-  webrtc::test::ScopedFieldTrials trial("WebRTC-SCM-Timestamp/Enabled/");
+TEST_F(PhysicalSocketTest, TestSocketRecvTimestampIPv6ScmExperimentDisabled) {
+  webrtc::test::ScopedFieldTrials trial("WebRTC-SCM-Timestamp/Disabled/");
   SocketTest::TestSocketRecvTimestampIPv6();
 }
+#endif
 
 // Verify that if the socket was unable to be bound to a real network interface
 // (not loopback), Bind will return an error.
@@ -524,14 +522,12 @@ TEST_F(PhysicalSocketTest,
 
 #endif
 
-TEST_F(PhysicalSocketTest, UdpSocketRecvTimestampUseRtcEpochIPv4ScmExperiment) {
+TEST_F(PhysicalSocketTest, UdpSocketRecvTimestampUseRtcEpochIPv4) {
   MAYBE_SKIP_IPV4;
-  webrtc::test::ScopedFieldTrials trial("WebRTC-SCM-Timestamp/Enabled/");
   SocketTest::TestUdpSocketRecvTimestampUseRtcEpochIPv4();
 }
 
-TEST_F(PhysicalSocketTest, UdpSocketRecvTimestampUseRtcEpochIPv6ScmExperiment) {
-  webrtc::test::ScopedFieldTrials trial("WebRTC-SCM-Timestamp/Enabled/");
+TEST_F(PhysicalSocketTest, UdpSocketRecvTimestampUseRtcEpochIPv6) {
   SocketTest::TestUdpSocketRecvTimestampUseRtcEpochIPv6();
 }