diff --git a/include/picconf.h b/include/picconf.h
index 0451123d..56e42e0f 100644
--- a/include/picconf.h
+++ b/include/picconf.h
@@ -9,7 +9,7 @@
 
 /* initial memory size (to be dynamically extended if necessary) */
 #define PIC_ARENA_SIZE 100
-#define PIC_HEAP_SIZE 8192
+#define PIC_HEAP_SIZE 16384
 #define PIC_STACK_SIZE 1024
 #define PIC_IREP_SIZE 256
 #define PIC_GLOBALS_SIZE 1024