diff --git a/.gn b/.gn
index ed92a1b296..65b7a6b158 100644
--- a/.gn
+++ b/.gn
@@ -50,6 +50,7 @@ default_args = {
   mac_sdk_min = "10.12"
 
   ios_deployment_target = "12.0"
+  mac_deployment_target = "10.13"
 
   # The SDK API level, in contrast, is set by build/android/AndroidManifest.xml.
   android32_ndk_api_level = 21