diff --git a/lib/commands/toolcontext.c b/lib/commands/toolcontext.c
index 92008a641..75634caff 100644
--- a/lib/commands/toolcontext.c
+++ b/lib/commands/toolcontext.c
@@ -230,7 +230,7 @@ static void _get_sysfs_dir(struct cmd_context *cmd, char *buf, size_t buf_size)
 		return;
 	}
 
-	strncpy(buf, sys_mnt, buf_size);
+	(void) dm_strncpy(buf, sys_mnt, buf_size);
 }
 
 static uint32_t _parse_debug_fields(struct cmd_context *cmd, int cfg, const char *cfgname)