diff --git a/reactos/lib/crt/io/dup.c b/reactos/lib/crt/io/dup.c
index 040497172cd..ed5a1c01389 100644
--- a/reactos/lib/crt/io/dup.c
+++ b/reactos/lib/crt/io/dup.c
@@ -13,25 +13,27 @@ int _dup(int handle)
   HANDLE hProcess = GetCurrentProcess();
   BOOL result;
   int fd;
+  int mode;
 
   hFile = (HANDLE)_get_osfhandle(handle);
 	if (hFile == INVALID_HANDLE_VALUE) {
 		__set_errno(EBADF);
 		return -1;
 	}
+  mode = __fileno_getmode(handle);
   result = DuplicateHandle(hProcess,
 	                   hFile,
 			   hProcess,
 			   &hFile,
 			   0,
-			   TRUE,
+                           mode & FNOINHERIT ? FALSE : TRUE,
 			   DUPLICATE_SAME_ACCESS);
 	if (result == FALSE) {
 		_dosmaperr(GetLastError());
 		return -1;
 	}
 
-  fd = alloc_fd(hFile, __fileno_getmode(handle));
+  fd = alloc_fd(hFile, mode);
   if (fd < 0)
   {
 	  CloseHandle(hFile);
diff --git a/reactos/lib/crt/io/open.c b/reactos/lib/crt/io/open.c
index c32304c0002..b59623fe6a0 100644
--- a/reactos/lib/crt/io/open.c
+++ b/reactos/lib/crt/io/open.c
@@ -523,7 +523,7 @@ int __fileno_dup2(int handle1, int handle2)
                 hProcess,
                 &fdinfo(handle2)->hFile,
                 0,
-                TRUE,
+                fdinfo(handle1)->fdflags & FNOINHERIT ? FALSE : TRUE,
                 DUPLICATE_SAME_ACCESS);
    if (result) {
 //      _pioinfo[handle2]->fd = handle2;