diff --git a/luprex/eris-master/src/lua.c b/luprex/eris-master/src/lua.c
index 4345e554..540c6e6f 100644
--- a/luprex/eris-master/src/lua.c
+++ b/luprex/eris-master/src/lua.c
@@ -83,7 +83,14 @@
 #endif
 
 
+void luai_writestring(const char *s, size_t len) {
+    fwrite((s), sizeof(char), (len), stdout);
+}
 
+void luai_writeline() {
+    fwrite("\n", sizeof(char), 1, stdout);
+    fflush(stdout);
+}
 
 static lua_State *globalL = NULL;
 
diff --git a/luprex/eris-master/src/luaconf.h b/luprex/eris-master/src/luaconf.h
index 89fe2202..730dae6c 100644
--- a/luprex/eris-master/src/luaconf.h
+++ b/luprex/eris-master/src/luaconf.h
@@ -210,9 +210,8 @@
 ** avoids including 'stdio.h' everywhere.)
 */
 #if defined(LUA_LIB) || defined(lua_c)
-#include <stdio.h>
-#define luai_writestring(s,l)	fwrite((s), sizeof(char), (l), stdout)
-#define luai_writeline()	(luai_writestring("\n", 1), fflush(stdout))
+extern void luai_writestring(const char *s, size_t len);
+extern void luai_writeline();
 #endif
 
 /*
diff --git a/luprex/eris-master/test/persist.c b/luprex/eris-master/test/persist.c
index 4f52de43..24fbbcbb 100644
--- a/luprex/eris-master/test/persist.c
+++ b/luprex/eris-master/test/persist.c
@@ -5,6 +5,15 @@
 #include "lualib.h"
 #include "lauxlib.h"
 
+void luai_writestring(const char *s, size_t len) {
+    fwrite((s), sizeof(char), (len), stdout);
+}
+
+void luai_writeline() {
+    fwrite("\n", sizeof(char), 1, stdout);
+    fflush(stdout);
+}
+
 static int LUAF_createludata(lua_State *L)
 {
 	lua_pushlightuserdata(L, (void*)321);
diff --git a/luprex/eris-master/test/unpersist.c b/luprex/eris-master/test/unpersist.c
index 19d312ae..f70562c8 100644
--- a/luprex/eris-master/test/unpersist.c
+++ b/luprex/eris-master/test/unpersist.c
@@ -5,6 +5,15 @@
 #include "lualib.h"
 #include "lauxlib.h"
 
+void luai_writestring(const char *s, size_t len) {
+    fwrite((s), sizeof(char), (len), stdout);
+}
+
+void luai_writeline() {
+    fwrite("\n", sizeof(char), 1, stdout);
+    fflush(stdout);
+}
+
 static int LUAF_checkludata(lua_State *L)
 {
 	lua_pushboolean(L, lua_touserdata(L, -1) == (void*)321);