diff --git a/src/type.h b/src/type.h
index ad7525d55..aaa8aba0d 100644
--- a/src/type.h
+++ b/src/type.h
@@ -17,9 +17,12 @@
 #ifndef WABT_TYPE_H_
 #define WABT_TYPE_H_
 
+#include <cassert>
 #include <cstdint>
 #include <vector>
 
+#include "config.h"
+
 namespace wabt {
 
 class Type;