diff --git a/src/puresize.h b/src/puresize.h
index 7563228a213..3f337ca2d52 100644
--- a/src/puresize.h
+++ b/src/puresize.h
@@ -42,7 +42,7 @@ Boston, MA 02111-1307, USA.  */
 #endif
 
 #ifndef BASE_PURESIZE
-#define BASE_PURESIZE (495000 + SYSTEM_PURESIZE_EXTRA + SITELOAD_PURESIZE_EXTRA)
+#define BASE_PURESIZE (500000 + SYSTEM_PURESIZE_EXTRA + SITELOAD_PURESIZE_EXTRA)
 #endif
 
 /* Increase BASE_PURESIZE by a ratio depending on the machine's word size.  */