diff --git a/src/d_main.c b/src/d_main.c
index 15116b53..5acfb610 100644
--- a/src/d_main.c
+++ b/src/d_main.c
@@ -143,6 +143,8 @@ boolean advancedemo;
 INT32 debugload = 0;
 #endif
 
+char savegamename[256];
+
 #ifdef _arch_dreamcast
 char srb2home[256] = "/cd";
 char srb2path[256] = "/cd";
diff --git a/src/doomdef.h b/src/doomdef.h
index ed41e346..392ba760 100644
--- a/src/doomdef.h
+++ b/src/doomdef.h
@@ -506,7 +506,7 @@ void CONS_Debug(INT32 debugflags, const char *fmt, ...) FUNCDEBUG;
 
 // Things that used to be in dstrings.h
 #define SAVEGAMENAME "srb2sav"
-char savegamename[256];
+extern char savegamename[256];
 
 // m_misc.h
 #ifdef GETTEXT
diff --git a/src/k_kart.h b/src/k_kart.h
index 2ba5d1bd..86ae0fcc 100644
--- a/src/k_kart.h
+++ b/src/k_kart.h
@@ -11,7 +11,7 @@
 
 #define KART_FULLTURN 800
 
-UINT8 colortranslations[MAXTRANSLATIONS][16];
+extern UINT8 colortranslations[MAXTRANSLATIONS][16];
 extern const char *KartColor_Names[MAXSKINCOLORS];
 extern const UINT8 KartColor_Opposite[MAXSKINCOLORS*2];
 void K_RainbowColormap(UINT8 *dest_colormap, UINT8 skincolor);
diff --git a/src/mserv.h b/src/mserv.h
index 09cd4f08..8f8152a7 100644
--- a/src/mserv.h
+++ b/src/mserv.h
@@ -68,7 +68,7 @@ extern consvar_t cv_masterserver, cv_servername;
 // < 0 to not connect (usually -1) (offline mode)
 // == 0 to show all rooms, not a valid hosting room
 // anything else is whatever room the MS assigns to that number (online mode)
-INT16 ms_RoomId;
+extern INT16 ms_RoomId;
 
 const char *GetMasterServerPort(void);
 const char *GetMasterServerIP(void);
diff --git a/src/s_sound.h b/src/s_sound.h
index 2a904faf..eeb1f0ab 100644
--- a/src/s_sound.h
+++ b/src/s_sound.h
@@ -236,7 +236,7 @@ void S_StopSoundByNum(sfxenum_t sfxnum);
 #ifdef MUSICSLOT_COMPATIBILITY
 // For compatibility with code/scripts relying on older versions
 // This is a list of all the "special" slot names and their associated numbers
-const char *compat_special_music_slots[16];
+extern const char *compat_special_music_slots[16];
 #endif
 
 #endif