diff --git a/include/config.h b/include/config.h
index a5410d52..e44239d9 100644
--- a/include/config.h
+++ b/include/config.h
@@ -12,7 +12,7 @@
 
 /* initial memory size (to be dynamically extended if necessary) */
 #define PIC_ARENA_SIZE 100
-#define PIC_HEAP_SIZE (20000 * 8)
+#define PIC_HEAP_SIZE (40000 * 8)
 #define PIC_STACK_SIZE 1024
 #define PIC_RESCUE_SIZE 30
 #define PIC_IREP_SIZE 256