diff --git a/CMakeLists.txt b/CMakeLists.txt
index 62cb14f6..e9f8aa25 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -61,6 +61,7 @@ set(AWE_SRCS
     ${SOURCE_DIR}/common/backtrace.c
     ${SOURCE_DIR}/common/buffer.c
     ${SOURCE_DIR}/common/luaclass.c
+    ${SOURCE_DIR}/common/lualib.c
     ${SOURCE_DIR}/common/luaobject.c
     ${SOURCE_DIR}/common/util.c
     ${SOURCE_DIR}/common/version.c
diff --git a/common/luaclass.c b/common/luaclass.c
index fbc7b04f..3efaea65 100644
--- a/common/luaclass.c
+++ b/common/luaclass.c
@@ -21,6 +21,7 @@
 
 #include "common/luaclass.h"
 #include "common/luaobject.h"
+#include "luaa.h"
 
 struct lua_class_property
 {
@@ -76,7 +77,7 @@ luaA_checkudata(lua_State *L, int ud, lua_class_t *class)
 {
     void *p = luaA_toudata(L, ud, class);
     if(!p)
-        luaL_typerror(L, ud, class->name);
+        luaA_typerror(L, ud, class->name);
     else if(class->checker && !class->checker(p))
         luaL_error(L, "invalid object");
     return p;
diff --git a/common/lualib.c b/common/lualib.c
new file mode 100644
index 00000000..ab0b3bad
--- /dev/null
+++ b/common/lualib.c
@@ -0,0 +1,62 @@
+/*
+ * lualib.h - useful functions and type for Lua
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#include "luaa.h"
+
+void luaA_checkfunction(lua_State *L, int idx)
+{
+    if(!lua_isfunction(L, idx))
+        luaA_typerror(L, idx, "function");
+}
+
+void luaA_checktable(lua_State *L, int idx)
+{
+    if(!lua_istable(L, idx))
+        luaA_typerror(L, idx, "table");
+}
+
+void luaA_dumpstack(lua_State *L)
+{
+    fprintf(stderr, "-------- Lua stack dump ---------\n");
+    for(int i = lua_gettop(L); i; i--)
+    {
+        int t = lua_type(L, i);
+        switch (t)
+        {
+          case LUA_TSTRING:
+            fprintf(stderr, "%d: string: `%s'\n", i, lua_tostring(L, i));
+            break;
+          case LUA_TBOOLEAN:
+            fprintf(stderr, "%d: bool:   %s\n", i, lua_toboolean(L, i) ? "true" : "false");
+            break;
+          case LUA_TNUMBER:
+            fprintf(stderr, "%d: number: %g\n", i, lua_tonumber(L, i));
+            break;
+          case LUA_TNIL:
+            fprintf(stderr, "%d: nil\n", i);
+            break;
+          default:
+            fprintf(stderr, "%d: %s\t#%d\t%p\n", i, lua_typename(L, t),
+                    (int) lua_objlen(L, i),
+                    lua_topointer(L, i));
+            break;
+        }
+    }
+    fprintf(stderr, "------- Lua stack dump end ------\n");
+}
diff --git a/common/lualib.h b/common/lualib.h
index 6173f8df..59d6a16d 100644
--- a/common/lualib.h
+++ b/common/lualib.h
@@ -23,56 +23,20 @@
 #define AWESOME_COMMON_LUALIB
 
 #include <lauxlib.h>
+
 #include "common/util.h"
+#include "common/luaclass.h"
 
 /** Lua function to call on dofuction() error */
 lua_CFunction lualib_dofunction_on_error;
 
-static inline void luaA_checkfunction(lua_State *L, int idx)
-{
-    if(!lua_isfunction(L, idx))
-        luaL_typerror(L, idx, "function");
-}
-
-static inline void luaA_checktable(lua_State *L, int idx)
-{
-    if(!lua_istable(L, idx))
-        luaL_typerror(L, idx, "table");
-}
+void luaA_checkfunction(lua_State *, int);
+void luaA_checktable(lua_State *, int);
 
 /** Dump the Lua stack. Useful for debugging.
  * \param L The Lua VM state.
  */
-static inline void
-luaA_dumpstack(lua_State *L)
-{
-    fprintf(stderr, "-------- Lua stack dump ---------\n");
-    for(int i = lua_gettop(L); i; i--)
-    {
-        int t = lua_type(L, i);
-        switch (t)
-        {
-          case LUA_TSTRING:
-            fprintf(stderr, "%d: string: `%s'\n", i, lua_tostring(L, i));
-            break;
-          case LUA_TBOOLEAN:
-            fprintf(stderr, "%d: bool:   %s\n", i, lua_toboolean(L, i) ? "true" : "false");
-            break;
-          case LUA_TNUMBER:
-            fprintf(stderr, "%d: number: %g\n", i, lua_tonumber(L, i));
-            break;
-          case LUA_TNIL:
-            fprintf(stderr, "%d: nil\n", i);
-            break;
-          default:
-            fprintf(stderr, "%d: %s\t#%d\t%p\n", i, lua_typename(L, t),
-                    (int) lua_objlen(L, i),
-                    lua_topointer(L, i));
-            break;
-        }
-    }
-    fprintf(stderr, "------- Lua stack dump end ------\n");
-}
+void luaA_dumpstack(lua_State *);
 
 /** Convert s stack index to positive.
  * \param L The Lua VM state.
diff --git a/luaa.h b/luaa.h
index 151b2eb7..cfdafd6e 100644
--- a/luaa.h
+++ b/luaa.h
@@ -186,6 +186,14 @@ luaA_warn(lua_State *L, const char *fmt, ...)
     fprintf(stderr, "\n");
 }
 
+static inline int
+luaA_typerror(lua_State *L, int narg, const char *tname)
+{
+    const char *msg = lua_pushfstring(L, "%s expected, got %s",
+                                      tname, luaL_typename(L, narg));
+    return luaL_argerror(L, narg, msg);
+}
+
 void luaA_init(xdgHandle *);
 bool luaA_parserc(xdgHandle *, const char *, bool);
 bool luaA_hasitem(lua_State *, const void *);