diff --git a/tools/continuous_build/build_internal/masters/master.tryserver.webrtc/slaves.cfg b/tools/continuous_build/build_internal/masters/master.tryserver.webrtc/slaves.cfg
index f98f74269..4fc8b3177 100644
--- a/tools/continuous_build/build_internal/masters/master.tryserver.webrtc/slaves.cfg
+++ b/tools/continuous_build/build_internal/masters/master.tryserver.webrtc/slaves.cfg
@@ -35,7 +35,7 @@ def mac():
       'version': '10.7',
       'bits': '64',
       'builder': 'mac',
-      'hostname': 'dhcp-172-28-249-242',
+      'hostname': 'dhcp-172-28-249-129',
     },
     {
       'master': 'TryServer',
@@ -43,7 +43,7 @@ def mac():
       'version': '10.7',
       'bits': '64',
       'builder': 'mac_rel',
-      'hostname': 'dhcp-172-28-249-244',
+      'hostname': 'dhcp-172-28-249-145',
     },
   ]
 
diff --git a/tools/continuous_build/build_internal/masters/master.webrtc/slaves.cfg b/tools/continuous_build/build_internal/masters/master.webrtc/slaves.cfg
index d8bbefbe2..df70dad2a 100644
--- a/tools/continuous_build/build_internal/masters/master.webrtc/slaves.cfg
+++ b/tools/continuous_build/build_internal/masters/master.webrtc/slaves.cfg
@@ -115,7 +115,7 @@ def mac():
       'version': '10.7',
       'bits': '64',
       'builder': 'MacOS32DBG',
-      'hostname': 'dhcp-172-28-249-243',
+      'hostname': 'dhcp-172-28-249-144',
     },
     {
       'master': 'WebRTC',
@@ -123,7 +123,7 @@ def mac():
       'version': '10.7',
       'bits': '64',
       'builder': 'MacOS32Release',
-      'hostname': 'dhcp-172-28-249-241',
+      'hostname': 'dhcp-172-28-249-167',
     },
   ]