diff --git a/include/reactos/idl/svcctl.idl b/include/reactos/idl/svcctl.idl
index fe4dc89ffb1..4966d17954c 100644
--- a/include/reactos/idl/svcctl.idl
+++ b/include/reactos/idl/svcctl.idl
@@ -434,7 +434,7 @@ interface svcctl
     /* Function 17 */
     DWORD RQueryServiceConfigW(
         [in] SC_RPC_HANDLE hService,
-        [out, unique, size_is(cbBufSize)] LPBYTE lpServiceConfig,
+        [out, size_is(cbBufSize)] LPBYTE lpServiceConfig,
         /* FIXME: should be [out] LPQUERY_SERVICE_CONFIGW lpServiceConfig, */
         [in, range(0, 1024*8)] DWORD cbBufSize,
         [out] LPBOUNDED_DWORD_8K pcbBytesNeeded);
@@ -546,7 +546,7 @@ interface svcctl
     /* Function 29 */
     DWORD RQueryServiceConfigA(
         [in] SC_RPC_HANDLE hService,
-        [out, unique, size_is(cbBufSize)] LPBYTE lpServiceConfig,
+        [out, size_is(cbBufSize)] LPBYTE lpServiceConfig,
         /* FIXME: should be [out] LPQUERY_SERVICE_CONFIGA lpServiceConfig, */
         [in, range(0, 1024*8)] DWORD cbBufSize,
         [out] LPBOUNDED_DWORD_8K pcbBytesNeeded);