diff --git a/reactos/sdk/lib/crt/stdio/file.c b/reactos/sdk/lib/crt/stdio/file.c
index 53462799920..8b67bd08379 100644
--- a/reactos/sdk/lib/crt/stdio/file.c
+++ b/reactos/sdk/lib/crt/stdio/file.c
@@ -528,10 +528,17 @@ static int msvcrt_flush_buffer(FILE* file)
 
         if(file->_flag & _IORW)
             file->_flag &= ~_IOWRT;
-    }
 
+#ifdef __REACTOS__ /* CORE-11949 */
     file->_ptr=file->_base;
     file->_cnt=0;
+#endif
+    }
+
+#ifndef __REACTOS__ /* CORE-11949 */
+    file->_ptr=file->_base;
+    file->_cnt=0;
+#endif
     return 0;
 }