diff --git a/lispBM/lispif.c b/lispBM/lispif.c
index 0b684358..a9342af0 100644
--- a/lispBM/lispif.c
+++ b/lispBM/lispif.c
@@ -30,8 +30,8 @@
 #include "lbm_prof.h"
 #include "utils.h"
 
-#define LBM_MEMORY_SIZE_18K LBM_MEMORY_SIZE_64BYTES_TIMES_X(256 + 64)
-#define LBM_MEMORY_BITMAP_SIZE_18K LBM_MEMORY_BITMAP_SIZE(256 + 64)
+#define LBM_MEMORY_SIZE_18K LBM_MEMORY_SIZE_64BYTES_TIMES_X(256 + 32)
+#define LBM_MEMORY_BITMAP_SIZE_18K LBM_MEMORY_BITMAP_SIZE(256 + 32)
 
 #define HEAP_SIZE					(2048 + 256 + 160)
 #define LISP_MEM_SIZE				LBM_MEMORY_SIZE_18K