diff --git a/src/modbus-data.c b/src/modbus-data.c
index 7e4fb10..e98f262 100644
--- a/src/modbus-data.c
+++ b/src/modbus-data.c
@@ -19,6 +19,8 @@
 # include <arpa/inet.h>
 #endif
 
+#include <config.h>
+
 #include "modbus.h"
 
 #if defined(HAVE_BYTESWAP_H)