diff --git a/Android.mk.in b/Android.mk.in
index 2c1b57175e..a73981db02 100644
--- a/Android.mk.in
+++ b/Android.mk.in
@@ -82,6 +82,7 @@ strongswan_CFLAGS := \
 	-DOPENSSL_NO_ECDSA \
 	-DOPENSSL_NO_ECDH \
 	-DOPENSSL_NO_ENGINE \
+	-DCONFIG_H_INCLUDED \
 	-DCAPABILITIES \
 	-DCAPABILITIES_NATIVE \
 	-DMONOLITHIC \