diff --git a/liba/include/unistd.h b/liba/include/unistd.h
index 8dadc4ad4..9b95be0b3 100644
--- a/liba/include/unistd.h
+++ b/liba/include/unistd.h
@@ -2,5 +2,6 @@
 #define LIBA_UNISTD_H
 
 #define SEEK_SET 0
+#define SEEK_CUR 1
 
 #endif
diff --git a/python/port/mpconfigport.h b/python/port/mpconfigport.h
index bfff743d6..53c3bb90a 100644
--- a/python/port/mpconfigport.h
+++ b/python/port/mpconfigport.h
@@ -119,8 +119,6 @@ typedef uintptr_t mp_uint_t; // must be pointer size
 
 typedef long mp_off_t;
 
-#define SEEK_CUR 1
-
 // extra built in names to add to the global namespace
 #define MICROPY_PORT_BUILTINS \
     { MP_OBJ_NEW_QSTR(MP_QSTR_open), (mp_obj_t)&mp_builtin_open_obj }, \