diff --git a/c74support/c74_msp.h b/c74support/c74_msp.h
index a5b8f78..51c8ec8 100644
--- a/c74support/c74_msp.h
+++ b/c74support/c74_msp.h
@@ -1,5 +1,7 @@
 #pragma once
 
+#include "c74_max.h"
+
 namespace c74 {
 namespace max {