diff --git a/fs/open.c b/fs/open.c
index c32c89d..8279c65 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -331,7 +331,9 @@
 
 asmlinkage long sys_ftruncate(unsigned int fd, unsigned long length)
 {
-	return do_sys_ftruncate(fd, length, 1);
+	long ret = do_sys_ftruncate(fd, length, 1);
+	prevent_tail_call(ret);
+	return ret;
 }
 
 /* LFS versions of truncate are only needed on 32 bit machines */
@@ -343,7 +345,9 @@
 
 asmlinkage long sys_ftruncate64(unsigned int fd, loff_t length)
 {
-	return do_sys_ftruncate(fd, length, 0);
+	long ret = do_sys_ftruncate(fd, length, 0);
+	prevent_tail_call(ret);
+	return ret;
 }
 #endif