diff --git a/muninlite.in b/muninlite.in
index 0b84bf8..df91b2b 100755
--- a/muninlite.in
+++ b/muninlite.in
@@ -12,6 +12,8 @@
 
 VERSION="@@VERSION@@"
 
+set -eu
+
 @@CONF@@
 
 # if plugindir_ is present in $PLUGINS, executables (scripts, binaries) in the specified path