diff --git a/lib/gen-version-script.sh b/lib/gen-version-script.sh
index 64a73749..84770011 100644
--- a/lib/gen-version-script.sh
+++ b/lib/gen-version-script.sh
@@ -1,3 +1,4 @@
+set -eu
 
 # we go through a bit of work to get the unmangled names of the
 # typeinfo symbols because of