diff --git a/dlls/hnetcfg/port.c b/dlls/hnetcfg/port.c
index 627ae39c939..c80b5f7bfce 100644
--- a/dlls/hnetcfg/port.c
+++ b/dlls/hnetcfg/port.c
@@ -319,7 +319,7 @@ static const struct INetFwOpenPortVtbl fw_port_vtbl =
     fw_port_get_BuiltIn
 };
 
-HRESULT NetFwOpenPort_create( IUnknown *pUnkOuter, LPVOID *ppObj )
+static HRESULT NetFwOpenPort_create( IUnknown *pUnkOuter, LPVOID *ppObj )
 {
     fw_port *fp;