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diff --git a/maint/travis-ci_scripts/common.bash b/maint/travis-ci_scripts/common.bash
old mode 100755
new mode 100644
index d2b77d8..48fb7c1
--- a/maint/travis-ci_scripts/common.bash
+++ b/maint/travis-ci_scripts/common.bash
@@ -1,5 +1,10 @@
 #!/bin/bash
 
+if [[ "${BASH_SOURCE[0]}" == "${0}" ]] ; then
+  echo "This script can not be executed standalone - it can only be source()d" 1>&2
+  exit 1
+fi
+
 # "autodie"
 set -e