diff --git a/gpgs/src/gpgs_callback.cpp b/gpgs/src/gpgs_callback.cpp
index bc76e5d..035833d 100644
--- a/gpgs/src/gpgs_callback.cpp
+++ b/gpgs/src/gpgs_callback.cpp
@@ -1,6 +1,5 @@
 #if defined(DM_PLATFORM_IOS) || defined(DM_PLATFORM_ANDROID)
 #include "private_gpgs_callback.h"
-#include "utils/LuaUtils.h"
 #include <stdlib.h>
 
 static GPGS_callback            m_callback;
diff --git a/gpgs/src/gpgs_extension.cpp b/gpgs/src/gpgs_extension.cpp
index 06eccf1..709a5d1 100644
--- a/gpgs/src/gpgs_extension.cpp
+++ b/gpgs/src/gpgs_extension.cpp
@@ -13,7 +13,6 @@
 #include "gpgs_extension.h"
 #include "private_gpgs_callback.h"
 #include "com_defold_gpgs_GpgsJNI.h"
-#include "utils/LuaUtils.h"
 
 
 struct GPGS
@@ -78,6 +77,85 @@ static GPGS_Achievement g_gpgs_achievement;
 static GPGS_Leaderboard g_gpgs_leaderboard;
 static GPGS_Events      g_gpgs_events;
 
+
+// generic utility functions
+
+
+static bool luaL_checkbool(lua_State *L, int numArg)
+{
+    bool b = false;
+    if (lua_isboolean(L, numArg))
+    {
+        b = lua_toboolean(L, numArg);
+    }
+    else
+    {
+        luaL_typerror(L, numArg, lua_typename(L, LUA_TBOOLEAN));
+    }
+    return b;
+}
+
+static bool luaL_checkboold(lua_State *L, int numArg, int def)
+{
+    int type = lua_type(L, numArg);
+    if (type != LUA_TNONE && type != LUA_TNIL)
+    {
+        return luaL_checkbool(L, numArg);
+    }
+    return def;
+}
+
+static lua_Number luaL_checknumberd(lua_State *L, int numArg, lua_Number def)
+{
+    int type = lua_type(L, numArg);
+    if (type != LUA_TNONE && type != LUA_TNIL)
+    {
+        return luaL_checknumber(L, numArg);
+    }
+    return def;
+}
+
+static char* luaL_checkstringd(lua_State *L, int numArg, const char* def)
+{
+    int type = lua_type(L, numArg);
+    if (type != LUA_TNONE && type != LUA_TNIL)
+    {
+        return (char*)luaL_checkstring(L, numArg);
+    }
+    return (char*)def;
+}
+
+static lua_Number luaL_checktable_number(lua_State *L, int numArg, const char* field, lua_Number def)
+{
+    lua_Number result = def;
+    if(lua_istable(L, numArg))
+    {
+        lua_getfield(L, numArg, field);
+        if(!lua_isnil(L, -1))
+        {
+            result = luaL_checknumber(L, -1);
+        }
+        lua_pop(L, 1);
+    }
+    return result;
+}
+
+static char* luaL_checktable_string(lua_State *L, int numArg, const char* field, char* def)
+{
+    char* result = def;
+    if(lua_istable(L, numArg))
+    {
+        lua_getfield(L, numArg, field);
+        if(!lua_isnil(L, -1))
+        {
+            result = (char*)luaL_checkstring(L, -1);
+        }
+        lua_pop(L, 1);
+    }
+    return result;
+}
+
+
 // generic JNI calls
 
 // void method(char*)
diff --git a/gpgs/src/utils/LuaUtils.cpp b/gpgs/src/utils/LuaUtils.cpp
deleted file mode 100755
index 6f465ac..0000000
--- a/gpgs/src/utils/LuaUtils.cpp
+++ /dev/null
@@ -1,89 +0,0 @@
-#include "LuaUtils.h"
-
-bool luaL_checkbool(lua_State *L, int numArg)
-{
-    bool b = false;
-    if (lua_isboolean(L, numArg))
-    {
-        b = lua_toboolean(L, numArg);
-    }
-    else
-    {
-        luaL_typerror(L, numArg, lua_typename(L, LUA_TBOOLEAN));
-    }
-    return b;
-}
-
-bool luaL_checkboold(lua_State *L, int numArg, int def)
-{
-    int type = lua_type(L, numArg);
-    if (type != LUA_TNONE && type != LUA_TNIL)
-    {
-        return luaL_checkbool(L, numArg);
-    }
-    return def;
-}
-
-lua_Number luaL_checknumberd(lua_State *L, int numArg, lua_Number def)
-{
-    int type = lua_type(L, numArg);
-    if (type != LUA_TNONE && type != LUA_TNIL)
-    {
-        return luaL_checknumber(L, numArg);
-    }
-    return def;
-}
-
-char* luaL_checkstringd(lua_State *L, int numArg, const char* def)
-{
-    int type = lua_type(L, numArg);
-    if (type != LUA_TNONE && type != LUA_TNIL)
-    {
-        return (char*)luaL_checkstring(L, numArg);
-    }
-    return (char*)def;
-}
-
-lua_Number luaL_checktable_number(lua_State *L, int numArg, const char* field, lua_Number def)
-{
-    lua_Number result = def;
-    if(lua_istable(L, numArg))
-    {
-        lua_getfield(L, numArg, field);
-        if(!lua_isnil(L, -1))
-        {
-            result = luaL_checknumber(L, -1);
-        }
-        lua_pop(L, 1);
-    }
-    return result;
-}
-
-char* luaL_checktable_string(lua_State *L, int numArg, const char* field, char* def)
-{
-    char* result = def;
-    if(lua_istable(L, numArg))
-    {
-        lua_getfield(L, numArg, field);
-        if(!lua_isnil(L, -1))
-        {
-            result = (char*)luaL_checkstring(L, -1);
-        }
-        lua_pop(L, 1);
-    }
-    return result;
-}
-
-void luaL_push_pair_str_num(lua_State *L, const char *key, int value)
-{
-    lua_pushstring(L, key);
-    lua_pushnumber(L, value);
-    lua_settable(L, -3);
-}
-
-void luaL_push_pair_str_str(lua_State *L, const char *key, const char *value)
-{
-    lua_pushstring(L, key);
-    lua_pushstring(L, value);
-    lua_settable(L, -3);
-}
diff --git a/gpgs/src/utils/LuaUtils.h b/gpgs/src/utils/LuaUtils.h
deleted file mode 100755
index e71c453..0000000
--- a/gpgs/src/utils/LuaUtils.h
+++ /dev/null
@@ -1,15 +0,0 @@
-#pragma once
-
-#include <dmsdk/sdk.h>
-
-bool luaL_checkbool(lua_State *L, int numArg);
-
-bool luaL_checkboold(lua_State *L, int numArg, int def);
-lua_Number luaL_checknumberd(lua_State *L, int numArg, lua_Number def);
-char* luaL_checkstringd(lua_State *L, int numArg, const char* def);
-
-lua_Number luaL_checktable_number(lua_State *L, int numArg, const char* field, lua_Number def);
-char* luaL_checktable_string(lua_State *L, int numArg, const char* field, char* def);
-
-void luaL_push_pair_str_num(lua_State *L, const char *key, int value);
-void luaL_push_pair_str_str(lua_State *L, const char *key, const char *value);