diff --git a/board/stmicroelectronics/stm32f746-disco/post-build.sh b/board/stmicroelectronics/stm32f746-disco/post-build.sh
index 03e9dcae8215..74c59fdb72dd 100755
--- a/board/stmicroelectronics/stm32f746-disco/post-build.sh
+++ b/board/stmicroelectronics/stm32f746-disco/post-build.sh
@@ -1,4 +1,6 @@
 #!/bin/sh
+set -eu
+
 BOARD_DIR="$(dirname "$0")"
 
 install -m 0644 -D "${BOARD_DIR}"/extlinux.conf "${TARGET_DIR}"/boot/extlinux/extlinux.conf