diff --git a/README.md b/README.md
index c3c531c..79521fd 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # NDNph: Named Data Networking packet headers
 
-[![Travis build status](https://img.shields.io/travis/com/yoursunny/NDNph?style=flat)](https://travis-ci.com/yoursunny/NDNph) [![Coveralls code coverage](https://img.shields.io/coveralls/github/yoursunny/NDNph?style=flat)](https://coveralls.io/github/yoursunny/NDNph) [![GitHub code size](https://img.shields.io/github/languages/code-size/yoursunny/NDNph?style=flat)](https://github.com/yoursunny/NDNph/)
+[![Travis build status](https://img.shields.io/travis/com/yoursunny/NDNph?style=flat)](https://travis-ci.com/github/yoursunny/NDNph) [![Coveralls code coverage](https://img.shields.io/coveralls/github/yoursunny/NDNph?style=flat)](https://coveralls.io/github/yoursunny/NDNph) [![GitHub code size](https://img.shields.io/github/languages/code-size/yoursunny/NDNph?style=flat)](https://github.com/yoursunny/NDNph)
 
 **NDNph** provides [Named Data Networking](https://named-data.net/) packet encoding and more in a header-only C++11 library. It is part of [esp8266ndn](https://github.com/yoursunny/esp8266ndn) that supports microcontroller programming in Arduino IDE. NDNph can also work independently on Linux and other platforms.
 
diff --git a/mk/format-code.sh b/mk/format-code.sh
index e5b2eee..b4d087c 100755
--- a/mk/format-code.sh
+++ b/mk/format-code.sh
@@ -1,4 +1,7 @@
 #!/bin/bash
+set -e
+set -o pipefail
 cd "$( dirname "${BASH_SOURCE[0]}" )"/..
+
 find -name '*.[hc]pp' -or -name '*.ino' | \
   xargs clang-format-8 -i -style=file
diff --git a/mk/update-list.sh b/mk/update-list.sh
index 65a6ff5..6949445 100755
--- a/mk/update-list.sh
+++ b/mk/update-list.sh
@@ -1,4 +1,6 @@
 #!/bin/bash
+set -e
+set -o pipefail
 cd "$( dirname "${BASH_SOURCE[0]}" )"/..
 
 (