diff --git a/sysoptions.h b/sysoptions.h
index 385914a..82249f5 100644
--- a/sysoptions.h
+++ b/sysoptions.h
@@ -10,6 +10,14 @@
 #define LOCAL_IDENT "SSH-2.0-dropbear_" DROPBEAR_VERSION
 #define PROGNAME "dropbear"
 
+#ifndef DROPBEAR_CLIENT
+#define DROPBEAR_CLIENT 0
+#endif
+
+#ifndef DROPBEAR_SERVER
+#define DROPBEAR_SERVER 0
+#endif
+
 /* Spec recommends after one hour or 1 gigabyte of data. One hour
  * is a bit too verbose, so we try 8 hours */
 #ifndef KEX_REKEY_TIMEOUT