diff --git a/functions.h b/functions.h
--- a/functions.h
+++ b/functions.h
@@ -86,7 +86,6 @@ StringID GetPlayerNameString(byte player
 void ShowInfo(const char *str);
 void CDECL ShowInfoF(const char *str, ...);
 void NORETURN CDECL error(const char *str, ...);
-void memswap(void *a, void *b, size_t size);
 
 /* ttd.c */
 uint32 Random();
diff --git a/misc.c b/misc.c
--- a/misc.c
+++ b/misc.c
@@ -77,13 +77,6 @@ void InitPlayerRandoms()
 		}
 }
 
-void memswap(void *a, void *b, size_t size) {
-	void *c = alloca(size);
-	memcpy(c, a, size);
-	memcpy(a, b, size);
-	memcpy(b, c, size);
-}
-
 void SetDate(uint date)
 {
 	YearMonthDay ymd;