diff --git a/.cirrus.yml b/.cirrus.yml
index 8f81344ff8..5419d0afbf 100644
--- a/.cirrus.yml
+++ b/.cirrus.yml
@@ -97,6 +97,7 @@ ci_template: &CI_TEMPLATE
 
   init_external_repos_script: ./ci/init-external-repos.sh
 
+  pre_build_script: ./ci/pre-build.sh
   build_script: ./ci/build.sh
   test_script: ./ci/test.sh
 
diff --git a/ci/pre-build.sh b/ci/pre-build.sh
new file mode 100755
index 0000000000..4dfedae2aa
--- /dev/null
+++ b/ci/pre-build.sh
@@ -0,0 +1,8 @@
+#/usr/bin/env bash
+#
+# If ZEEK_CI_PREBUILD_COMMAND is not empty, execute it via bash -c. That's it.
+set -ex
+
+if [ -n "$ZEEK_CI_PREBUILD_COMMAND" ]; then
+    bash -c "$ZEEK_CI_PREBUILD_COMMAND"
+fi