diff --git a/src/space.h b/src/space.h
index 51122dcb4b6415b4c58f0fe8e9b788dc0bea2948..cbdfe8c0ee004e4e02e408eae70b6c171bf0d5e1 100644
--- a/src/space.h
+++ b/src/space.h
@@ -25,11 +25,11 @@
 #define space_cellallocchunk            1000
 #define space_splitratio                0.875f
 #define space_splitsize_default         400
-#define space_maxsize_default           25000000
-#define space_subsize_default           5000
+#define space_maxsize_default           8000000
+#define space_subsize_default           8000000
 #define space_stretch                   1.10f
 #define space_maxreldx                  0.25f
-#define space_qstack                    1024
+#define space_qstack                    2048
 
 
 /* Convert cell location to ID. */