diff --git a/build/gen.py b/build/gen.py
index 29085c9..eb07c22 100755
--- a/build/gen.py
+++ b/build/gen.py
@@ -531,7 +531,7 @@
       ])
 
     elif platform.is_darwin():
-      min_mac_version_flag = '-mmacosx-version-min=10.9'
+      min_mac_version_flag = '-mmacosx-version-min=10.12'
       cflags.append(min_mac_version_flag)
       ldflags.append(min_mac_version_flag)
     elif platform.is_aix():