diff --git a/wpa_supplicant/eap_register.c b/wpa_supplicant/eap_register.c
index e5f43aa68..b3faaa1d2 100644
--- a/wpa_supplicant/eap_register.c
+++ b/wpa_supplicant/eap_register.c
@@ -17,6 +17,7 @@
 #include "common.h"
 #include "eap_peer/eap_methods.h"
 #include "eap_server/eap_methods.h"
+#include "wpa_supplicant_i.h"
 
 
 /**