diff --git a/src/doomdef.h b/src/doomdef.h
index 796221c91..da5ddb5fe 100644
--- a/src/doomdef.h
+++ b/src/doomdef.h
@@ -161,6 +161,9 @@ extern FILE *logstream;
 // Comment or uncomment this as necessary.
 #define USE_PATCH_DTA
 
+// Use .kart extension addons
+//#define USE_KART
+
 // Modification options
 // If you want to take advantage of the Master Server's ability to force clients to update
 // to the latest version, fill these out.  Otherwise, just comment out UPDATE_ALERT and leave
diff --git a/src/filesrch.c b/src/filesrch.c
index e71b39d91..0276e1c90 100644
--- a/src/filesrch.c
+++ b/src/filesrch.c
@@ -552,7 +552,11 @@ filestatus_t filesearch(char *filename, const char *startpath, const UINT8 *want
 
 char exttable[NUM_EXT_TABLE][7] = { // maximum extension length (currently 4) plus 3 (null terminator, stop, and length including previous two)
 	"\5.txt", "\5.cfg", // exec
-	"\5.wad", "\6.kart", "\5.pk3", "\5.soc", "\5.lua"}; // addfile
+	"\5.wad",
+#ifdef USE_KART
+	"\6.kart",
+#endif
+	"\5.pk3", "\5.soc", "\5.lua"}; // addfile
 
 char filenamebuf[MAX_WADFILES][MAX_WADPATH];
 
diff --git a/src/filesrch.h b/src/filesrch.h
index 94c43ffa4..4186271b0 100644
--- a/src/filesrch.h
+++ b/src/filesrch.h
@@ -55,7 +55,9 @@ typedef enum
 	EXT_CFG,
 	EXT_LOADSTART,
 	EXT_WAD = EXT_LOADSTART,
+#ifdef USE_KART
 	EXT_KART,
+#endif
 	EXT_PK3,
 	EXT_SOC,
 	EXT_LUA, // allowed even if not HAVE_BLUA so that we can yell on load attempt
diff --git a/src/m_menu.c b/src/m_menu.c
index 5aad35896..b5161259c 100644
--- a/src/m_menu.c
+++ b/src/m_menu.c
@@ -3987,7 +3987,9 @@ static void M_Addons(INT32 choice)
 	addonsp[EXT_TXT] = W_CachePatchName("M_FTXT", PU_STATIC);
 	addonsp[EXT_CFG] = W_CachePatchName("M_FCFG", PU_STATIC);
 	addonsp[EXT_WAD] = W_CachePatchName("M_FWAD", PU_STATIC);
+#ifdef USE_KART
 	addonsp[EXT_KART] = W_CachePatchName("M_FKART", PU_STATIC);
+#endif
 	addonsp[EXT_PK3] = W_CachePatchName("M_FPK3", PU_STATIC);
 	addonsp[EXT_SOC] = W_CachePatchName("M_FSOC", PU_STATIC);
 	addonsp[EXT_LUA] = W_CachePatchName("M_FLUA", PU_STATIC);
@@ -4434,7 +4436,9 @@ static void M_HandleAddons(INT32 choice)
 						// else intentional fallthrough
 						case EXT_SOC:
 						case EXT_WAD:
+#ifdef USE_KART
 						case EXT_KART:
+#endif
 						case EXT_PK3:
 							COM_BufAddText(va("addfile \"%s%s\"", menupath, dirmenu[dir_on[menudepthleft]]+DIR_STRING));
 							break;