diff --git a/src/openvpnserv/interactive.c b/src/openvpnserv/interactive.c
index e25c511..bd310e4 100644
--- a/src/openvpnserv/interactive.c
+++ b/src/openvpnserv/interactive.c
@@ -3484,7 +3484,7 @@
     swprintf(ovpn_pipe_name, _countof(ovpn_pipe_name),
              L"\\\\.\\pipe\\" _L(PACKAGE) L"%ls\\service_%lu_%ls", service_instance,
              GetCurrentThreadId(), pipe_uuid_str);
-    RpcStringFree(&pipe_uuid_str);
+    RpcStringFreeW(&pipe_uuid_str);
 
     /* make a security descriptor for the named pipe with access
      * restricted to the user and SYSTEM