diff --git a/config/ext.json b/config/ext.json
index 79936c57..c521a61f 100644
--- a/config/ext.json
+++ b/config/ext.json
@@ -383,7 +383,7 @@
     },
     "opcache": {
         "type": "builtin",
-        "arg-type": "custom"
+        "arg-type-unix": "custom"
     },
     "openssl": {
         "notes": true,