diff --git a/Dockerfile b/Dockerfile
index 8f9ceaf..7986952 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -3,6 +3,9 @@ FROM resin/raspberrypi-buildpack-deps
 # Enable systemd, as Resin requires this
 ENV INITSYSTEM on
 
+# Make the hardware type available as a runtime env var
+ENV RESIN_ARCH %%RESIN_ARCH%%
+
 # Version number of gateway software.
 # (Incrementing this simply forces Docker to flush its cache
 #  and thus forces a full rebuild. Not used outside of Dockerfile.)