diff --git a/container_definitions/amd64/ack.yaml b/container_definitions/amd64/ack.yaml
new file mode 100644
index 0000000..ea72adc
--- /dev/null
+++ b/container_definitions/amd64/ack.yaml
@@ -0,0 +1,3 @@
+---
+spack:
+  specs: [ack]