diff --git a/fs/vfs/fs_dup2.c b/fs/vfs/fs_dup2.c
index 82573826602..95ad2a4d1b5 100644
--- a/fs/vfs/fs_dup2.c
+++ b/fs/vfs/fs_dup2.c
@@ -83,7 +83,10 @@ int file_dup2(FAR struct file *filep1, FAR struct file *filep2)
   /* Then clone the file structure */
 
   memset(&temp, 0, sizeof(temp));
-  temp.f_oflags = filep1->f_oflags;
+
+  /* The two filep don't share flags (the close-on-exec flag). */
+
+  temp.f_oflags = filep1->f_oflags & ~O_CLOEXEC;
   temp.f_pos    = filep1->f_pos;
   temp.f_inode  = inode;