diff --git a/config/pkg/ext/ext-memcache.yml b/config/pkg/ext/ext-memcache.yml
index 9db51c05..6e1f4385 100644
--- a/config/pkg/ext/ext-memcache.yml
+++ b/config/pkg/ext/ext-memcache.yml
@@ -11,4 +11,7 @@ ext-memcache:
     - ext-zlib
     - ext-session
   php-extension:
+    os:
+      - Linux
+      - Darwin
     arg-type: '--enable-memcache@shared_suffix@ --with-zlib-dir=@build_root_path@'
diff --git a/config/pkg/ext/ext-memcached.yml b/config/pkg/ext/ext-memcached.yml
index 329227f2..b320c669 100644
--- a/config/pkg/ext/ext-memcached.yml
+++ b/config/pkg/ext/ext-memcached.yml
@@ -20,4 +20,7 @@ ext-memcached:
     - ext-msgpack
     - ext-session
   php-extension:
+    os:
+      - Linux
+      - Darwin
     arg-type: '--enable-memcached@shared_suffix@ --with-zlib-dir=@build_root_path@'