diff --git a/include/405_dimm.h b/include/405_dimm.h
new file mode 100644
index 0000000000..b2bbe870e9
--- /dev/null
+++ b/include/405_dimm.h
@@ -0,0 +1,5 @@
+#ifndef _405_dimm_h_
+#define _405_dimm_h_
+long int walnut_dimm(void);
+#endif
+