--- common.h
+++ common.h
@@ -125,8 +125,8 @@
  * kB <-> number of pages.
  * Page size depends on machine architecture (4 kB, 8 kB, 16 kB, 64 kB...)
  */
-#define KB_TO_PG(k)	((k) >> kb_shift)
-#define PG_TO_KB(k)	((k) << kb_shift)
+#define KB_TO_PG(k)	((k) / (getpagesize()/1024) )
+#define PG_TO_KB(k)	((k) * (getpagesize()/1024) )
 
 /*
  ***************************************************************************