diff --git a/evrpc-internal.h b/evrpc-internal.h
index e53d06e0..9eb37638 100644
--- a/evrpc-internal.h
+++ b/evrpc-internal.h
@@ -27,6 +27,7 @@
 #ifndef EVRPC_INTERNAL_H_INCLUDED_
 #define EVRPC_INTERNAL_H_INCLUDED_
 
+#include "event2/http.h"
 #include "http-internal.h"
 
 struct evrpc;