diff --git a/fs/open.c b/fs/open.c
index ca9981c4a65..0d515d16197 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -210,6 +210,9 @@ int do_truncate(struct dentry *dentry, loff_t length, unsigned int time_attrs,
 		newattrs.ia_valid |= ATTR_FILE;
 	}
 
+	/* Remove suid/sgid on truncate too */
+	newattrs.ia_valid |= should_remove_suid(dentry);
+
 	mutex_lock(&dentry->d_inode->i_mutex);
 	err = notify_change(dentry, &newattrs);
 	mutex_unlock(&dentry->d_inode->i_mutex);