diff --git a/reactos/include/reactos/subsys/win/conmsg.h b/reactos/include/reactos/subsys/win/conmsg.h
index d817b52ac47..c29934eee5a 100644
--- a/reactos/include/reactos/subsys/win/conmsg.h
+++ b/reactos/include/reactos/subsys/win/conmsg.h
@@ -187,7 +187,7 @@ typedef struct _CONSRV_API_CONNECTINFO
     CONSOLE_START_INFO ConsoleStartInfo;
 } CONSRV_API_CONNECTINFO, *PCONSRV_API_CONNECTINFO;
 
-//C_ASSERT(sizeof(CONSRV_API_CONNECTINFO) == 0x638);
+C_ASSERT(sizeof(CONSRV_API_CONNECTINFO) == 0x638);
 
 typedef struct
 {