--- a/src/modules/janssonrpcc/netstring.h
+++ b/src/modules/janssonrpcc/netstring.h
@@ -24,6 +24,7 @@
 #define __NETSTRING_STREAM_H
 
 #include <string.h>
+#include <event2/buffer.h>
 #include <event2/bufferevent.h>
 
 typedef struct {