diff --git a/polymer/eduke32/source/gamedef.c b/polymer/eduke32/source/gamedef.c
index cd1491b3e..c81e9ce51 100644
--- a/polymer/eduke32/source/gamedef.c
+++ b/polymer/eduke32/source/gamedef.c
@@ -2457,6 +2457,66 @@ void C_InitQuotes(void)
     }
 }
 
+LUNATIC_EXTERN void C_SetCfgName(const char *cfgname)
+{
+    char temp[BMAX_PATH];
+    struct Bstat st;
+    int32_t fullscreen = ud.config.ScreenMode;
+    int32_t xdim = ud.config.ScreenWidth, ydim = ud.config.ScreenHeight, bpp = ud.config.ScreenBPP;
+    int32_t usemouse = ud.config.UseMouse, usejoy = ud.config.UseJoystick;
+#ifdef USE_OPENGL
+    int32_t glrm = glrendmode;
+#endif
+
+    if (Bstrcmp(setupfilename, SETUPFILENAME) != 0) // set to something else via -cfg
+        return;
+
+    if (Bstat(g_modDir, &st) < 0)
+    {
+        if (errno == ENOENT)     // path doesn't exist
+        {
+            if (Bmkdir(g_modDir, S_IRWXU) < 0)
+            {
+                OSD_Printf("Failed to create configuration file directory %s\n", g_modDir);
+                return;
+            }
+            else OSD_Printf("Created configuration file directory %s\n", g_modDir);
+        }
+        else
+        {
+            // another type of failure
+            return;
+        }
+    }
+    else if ((st.st_mode & S_IFDIR) != S_IFDIR)
+    {
+        // directory isn't a directory
+        return;
+    }
+
+    // XXX
+    Bstrcpy(temp, cfgname);
+    CONFIG_WriteSetup(1);
+    if (g_modDir[0] != '/')
+        Bsprintf(setupfilename,"%s/",g_modDir);
+    else setupfilename[0] = 0;
+    Bstrcat(setupfilename,temp);
+
+    initprintf("Using config file \"%s\".\n",setupfilename);
+
+    CONFIG_ReadSetup();
+
+    ud.config.ScreenMode = fullscreen;
+    ud.config.ScreenWidth = xdim;
+    ud.config.ScreenHeight = ydim;
+    ud.config.ScreenBPP = bpp;
+    ud.config.UseMouse = usemouse;
+    ud.config.UseJoystick = usejoy;
+#ifdef USE_OPENGL
+    glrendmode = glrm;
+#endif
+}
+
 #if !defined LUNATIC
 static int32_t C_ParseCommand(int32_t loop)
 {
@@ -5516,63 +5576,8 @@ repeatcase:
                     j++;
                 }
                 tempbuf[j] = '\0';
-                if (Bstrcmp(setupfilename,SETUPFILENAME) == 0) // not set to something else via -cfg
-                {
-                    char temp[BMAX_PATH];
-                    struct Bstat st;
-                    int32_t fullscreen = ud.config.ScreenMode;
-                    int32_t xdim = ud.config.ScreenWidth, ydim = ud.config.ScreenHeight, bpp = ud.config.ScreenBPP;
-                    int32_t usemouse = ud.config.UseMouse, usejoy = ud.config.UseJoystick;
-#ifdef USE_OPENGL
-                    int32_t glrm = glrendmode;
-#endif
 
-                    if (Bstat(g_modDir, &st) < 0)
-                    {
-                        if (errno == ENOENT)     // path doesn't exist
-                        {
-                            if (Bmkdir(g_modDir, S_IRWXU) < 0)
-                            {
-                                OSD_Printf("Failed to create configuration file directory %s\n", g_modDir);
-                                continue;
-                            }
-                            else OSD_Printf("Created configuration file directory %s\n", g_modDir);
-                        }
-                        else
-                        {
-                            // another type of failure
-                            continue;
-                        }
-                    }
-                    else if ((st.st_mode & S_IFDIR) != S_IFDIR)
-                    {
-                        // directory isn't a directory
-                        continue;
-                    }
-
-                    // XXX
-                    Bstrcpy(temp,tempbuf);
-                    CONFIG_WriteSetup(1);
-                    if (g_modDir[0] != '/')
-                        Bsprintf(setupfilename,"%s/",g_modDir);
-                    else setupfilename[0] = 0;
-                    Bstrcat(setupfilename,temp);
-
-                    initprintf("Using config file \"%s\".\n",setupfilename);
-
-                    CONFIG_ReadSetup();
-
-                    ud.config.ScreenMode = fullscreen;
-                    ud.config.ScreenWidth = xdim;
-                    ud.config.ScreenHeight = ydim;
-                    ud.config.ScreenBPP = bpp;
-                    ud.config.UseMouse = usemouse;
-                    ud.config.UseJoystick = usejoy;
-#ifdef USE_OPENGL
-                    glrendmode = glrm;
-#endif
-
-                }
+                C_SetCfgName(tempbuf);
             }
             continue;
 
diff --git a/polymer/eduke32/source/lunatic/defs.ilua b/polymer/eduke32/source/lunatic/defs.ilua
index f8a49192b..cc9f03531 100644
--- a/polymer/eduke32/source/lunatic/defs.ilua
+++ b/polymer/eduke32/source/lunatic/defs.ilua
@@ -716,6 +716,7 @@ void C_DefineProjectile(int32_t j, int32_t what, int32_t val);
 void C_DefineGameFuncName(int32_t idx, const char *name);
 void C_DefineGameType(int32_t idx, int32_t flags, const char *name);
 int32_t C_SetDefName(const char *name);
+void C_SetCfgName(const char *cfgname);
 
 int32_t SCRIPT_GetNumber(int32_t scripthandle, const char *sectionname, const char *entryname, int32_t *number);
 void SCRIPT_PutNumber(int32_t scripthandle, const char *sectionname, const char *entryname, int32_t number,
diff --git a/polymer/eduke32/source/lunatic/lunacon.lua b/polymer/eduke32/source/lunatic/lunacon.lua
index f1dd2976f..19f8a700d 100644
--- a/polymer/eduke32/source/lunatic/lunacon.lua
+++ b/polymer/eduke32/source/lunatic/lunacon.lua
@@ -1261,6 +1261,13 @@ function Cmd.setdefname(filename)
     end
 end
 
+function Cmd.setcfgname(filename)
+    assert(type(filename)=="string")
+    if (ffi) then
+        ffiC.C_SetCfgName(filename)
+    end
+end
+
 function Cmd.gamestartup(...)
     local args = {...}
 
@@ -1684,7 +1691,7 @@ local Couter = {
     dynamicsoundremap = cmd()
         / Cmd.dynamicsoundremap,
     setcfgname = sp1 * tok.filename
-        / Cmd.nyi("`setcfgname'"),
+        / Cmd.setcfgname,
     setdefname = sp1 * tok.filename
         / Cmd.setdefname,
     setgamename = newline_term_string