Index: src/main/extractor.c
===================================================================
--- src/main/extractor.c	(revision 11846)
+++ src/main/extractor.c	(working copy)
@@ -2254,7 +2254,7 @@
       pg = sysconf (_SC_PAGE_SIZE);
 #else
       GetSystemInfo(&sys);
-      pg = sys.dwPageSize;
+      pg = sys.dwAllocationGranularity;
 #endif
       if ( (pg > 0) &&
 	   (pg < MAX_READ) )