diff --git a/src/lib/mp3.c b/src/lib/mp3.c
index 9f69e9ac5..e94af6431 100644
--- a/src/lib/mp3.c
+++ b/src/lib/mp3.c
@@ -60,7 +60,11 @@ void mp3Init(ALHeap *heap)
 
 	var8009c6d8 = alHeapAlloc(heap, 256 * sizeof(var8009c6d8[0]), 1);
 	var8009c6dc = alHeapAlloc(heap, 256 * sizeof(var8009c6dc[0]), 1);
+#ifdef PLATFORM_64BIT
+	var8009c640 = alHeapAlloc(heap, 2*10500 * sizeof(struct mp3decfourbytes), 1);
+#else
 	var8009c640 = alHeapAlloc(heap, 10500 * sizeof(struct mp3decfourbytes), 1);
+#endif
 	var8009c644 = alHeapAlloc(heap, 8192 * sizeof(var8009c644[0]), 1);
 
 	mp3mainInit();
diff --git a/src/lib/snd.c b/src/lib/snd.c
index 6beac208b..c2c88d694 100644
--- a/src/lib/snd.c
+++ b/src/lib/snd.c
@@ -1460,7 +1460,7 @@ void sndInit(void)
 #endif
 
 #ifdef PLATFORM_64BIT
-	heaplen = 1024 * 661;
+	heaplen = 1024 * 745;
 #endif
 
 	g_Vars.langfilteron = false;