diff --git a/main.c b/main.c
index 9edb6d6..99f9588 100644
--- a/main.c
+++ b/main.c
@@ -15,8 +15,8 @@
 ** the top. -Olin
 */
 #if !defined(DEFAULT_HEAP_SIZE)
-/* 2.5 megacell = 10 megabytes (5 meg per semispace) */
-#define DEFAULT_HEAP_SIZE 2500000L
+/* 3 megacell = 12 megabytes (6 meg per semispace) */
+#define DEFAULT_HEAP_SIZE 3000000L
 #endif
 
 #if !defined(DEFAULT_STACK_SIZE)