--- sa.h
+++ sa.h
@@ -75,7 +75,7 @@
  * kB -> number of pages.
  * Page size depends on machine architecture (4 kB, 8 kB, 16 kB, 64 kB...)
  */
-#define PG(k)	((k) >> kb_shift)
+#define PG(k)	((k) / (getpagesize() / 1024))
 
 /* Keywords */
 #define K_XALL	"XALL"