diff --git a/apps/plugins/doom/m_misc.c b/apps/plugins/doom/m_misc.c
index 43e2a3888b..d3e6098b5d 100644
--- a/apps/plugins/doom/m_misc.c
+++ b/apps/plugins/doom/m_misc.c
@@ -797,11 +797,16 @@ int numdefaults;
 void M_SaveDefaults (void)
 {
    int i,fd;
+   uint32_t magic = DOOM_CONFIG_MAGIC;
+   uint32_t ver = DOOM_CONFIG_VERSION;
 
    fd = open (GAMEBASE"default.dfg", O_WRONLY|O_CREAT|O_TRUNC);
    if (fd<0)
       return; // can't write the file, but don't complain
 
+   write(fd,&magic,sizeof(magic));
+   write(fd,&ver,sizeof(ver));
+
    for (i=0 ; i<numdefaults ; i++)
       if(defaults[i].location.pi)
          write(fd,defaults[i].location.pi, sizeof(int));
@@ -833,7 +838,9 @@ struct default_s *M_LookupDefault(const char *name)
 
 void M_LoadDefaults (void)
 {
-     int   i;
+   int i;
+   uint32_t magic = 0;
+   uint32_t ver;
    int fd;
      // set everything to base values
 
@@ -849,6 +856,18 @@ void M_LoadDefaults (void)
    if (fd<0)
       return; // don't have anything to read
 
+   read(fd,&magic,sizeof(magic));
+   if (magic != DOOM_CONFIG_MAGIC) {
+      close(fd);
+      return;
+   }
+
+   read(fd,&ver,sizeof(ver));
+   if (ver != DOOM_CONFIG_VERSION) {
+      close(fd);
+      return;
+   }
+
    for (i=0 ; i<numdefaults ; i++)
       if(defaults[i].location.pi)
          read(fd,defaults[i].location.pi, sizeof(int));
diff --git a/apps/plugins/doom/rockmacros.h b/apps/plugins/doom/rockmacros.h
index 8f028d4893..047fa24bf9 100644
--- a/apps/plugins/doom/rockmacros.h
+++ b/apps/plugins/doom/rockmacros.h
@@ -91,4 +91,13 @@ inline void* memcpy(void* dst, const void* src, size_t size);
 #define NO_PREDEFINED_LUMPS
 #define TABLES_AS_LUMPS // This frees up alot of space in the plugin buffer
 //#define FANCY_MENU  // This is a call to allow load_main_backdrop to run in doom
+
+#define MAKE_FOURCC(a,b,c,d) (uint32_t)((((a)<<24)|((b)<<16)|((c)<<8)|(d)))
+
+/* Config file magic - increment the version number whenever the settings
+   structure changes.
+ */
+#define DOOM_CONFIG_MAGIC     MAKE_FOURCC('D','O','O','M')
+#define DOOM_CONFIG_VERSION   1
+
 #endif