diff --git a/libmctp-sizes.h.in b/libmctp-sizes.h.in
new file mode 100644
index 0000000..cbca7a9
--- /dev/null
+++ b/libmctp-sizes.h.in
@@ -0,0 +1,3 @@
+#pragma once
+
+#define MCTP_SIZEOF_STRUCT_MCTP @sizeof_struct_mctp@