diff --git a/script/test b/script/test
index f278023a0..ab0645fdc 100755
--- a/script/test
+++ b/script/test
@@ -9,6 +9,7 @@ docker build -t "$TAG" .
 docker run \
   --rm \
   --volume="/var/run/docker.sock:/var/run/docker.sock" \
+  --volume="$(pwd):/code" \
   -e DOCKER_VERSIONS \
   -e "TAG=$TAG" \
   --entrypoint="script/test-versions" \
diff --git a/script/test-versions b/script/test-versions
index 9f30eecaa..a9e3bc4c7 100755
--- a/script/test-versions
+++ b/script/test-versions
@@ -4,6 +4,9 @@
 
 set -e
 
+>&2 echo "Validating DCO"
+script/validate-dco
+
 >&2 echo "Running lint checks"
 flake8 compose
 
diff --git a/script/validate-dco b/script/validate-dco
index 1c75d91bf..701ac5e46 100755
--- a/script/validate-dco
+++ b/script/validate-dco
@@ -1,5 +1,7 @@
 #!/bin/bash
 
+set -e
+
 source "$(dirname "$BASH_SOURCE")/.validate"
 
 adds=$(validate_diff --numstat | awk '{ s += $1 } END { print s }')