diff --git a/byterun/config.h b/byterun/config.h
index 57d7947b9..22abe871d 100644
--- a/byterun/config.h
+++ b/byterun/config.h
@@ -135,7 +135,7 @@ typedef struct { uint32 l, h; } uint64, int64;
 #define Minor_heap_max (1 << 28)
 
 /* Default size of the minor zone. (words)  */
-#define Minor_heap_def 32768
+#define Minor_heap_def 262144
 
 
 /* Minimum size increment when growing the heap (words).