diff --git a/test/unit/lwipopts.h b/test/unit/lwipopts.h
index fce2f064..88e76d7a 100644
--- a/test/unit/lwipopts.h
+++ b/test/unit/lwipopts.h
@@ -32,6 +32,11 @@
 #ifndef __LWIPOPTS_H__
 #define __LWIPOPTS_H__
 
+/* Prevent having to link sys_arch.c (we don't test the API layers in unit tests) */
+#define NO_SYS                          1
+#define LWIP_NETCONN                    0
+#define LWIP_SOCKET                     0
+
 /* Minimal changes to opt.h required for tcp unit tests: */
 #define MEM_SIZE                        16000
 #define TCP_SND_QUEUELEN                40