diff --git a/include/sys/param.h b/include/sys/param.h
index d6b4f761f3..dbcdb6e9c1 100644
--- a/include/sys/param.h
+++ b/include/sys/param.h
@@ -1,8 +1,10 @@
 #ifndef _SPL_PARAM_H
 #define _SPL_PARAM_H
 
+#include <asm/page.h>
+
 /* Pages to bytes and back */
-#define ptob(pages)			(pages * PAGE_SIZE)
-#define btop(bytes)			(bytes / PAGE_SIZE)
+#define ptob(pages)			(pages << PAGE_SHIFT)
+#define btop(bytes)			(bytes >> PAGE_SHIFT)
 
 #endif /* SPL_PARAM_H */