diff --git a/sdk/lib/crt/stdio/file.c b/sdk/lib/crt/stdio/file.c
index 0793a3fffa..40cda33700 100644
--- a/sdk/lib/crt/stdio/file.c
+++ b/sdk/lib/crt/stdio/file.c
@@ -434,7 +434,7 @@ unsigned create_io_inherit_block(WORD *size, BYTE **block)
   for (fd = 0; fd < last_fd; fd++)
   {
     /* to be inherited, we need it to be open, and that DONTINHERIT isn't set */
-    fdinfo = get_ioinfo(fd);
+    fdinfo = get_ioinfo_nolock(fd);
     if ((fdinfo->wxflag & (WX_OPEN | WX_DONTINHERIT)) == WX_OPEN)
     {
       *wxflag_ptr = fdinfo->wxflag;
@@ -445,7 +445,6 @@ unsigned create_io_inherit_block(WORD *size, BYTE **block)
       *wxflag_ptr = 0;
       *handle_ptr = INVALID_HANDLE_VALUE;
     }
-    release_ioinfo(fdinfo);
     wxflag_ptr++; handle_ptr++;
   }
   return TRUE;