diff --git a/kernel-src/fs/file.c b/kernel-src/fs/file.c
index 73722c2d..d847d2ff 100644
--- a/kernel-src/fs/file.c
+++ b/kernel-src/fs/file.c
@@ -269,9 +269,8 @@ int fd_dup(int oldfd, int newfd, bool exact, int fdflags, int *retfd) {
 		int fd = getfree(newfd);
 
 		if (fd == -1) {
-			size_t newsize = newfd < proc->fdcount ? proc->fdcount + 1 : newfd;
-			fd = newsize - 1;
-			err = growtable(newsize);
+			fd = newfd < proc->fdcount ? proc->fdcount : newfd;
+			err = growtable(fd + 1);
 			if (err)
 				goto cleanup;
 		}