diff --git a/libfio.c b/libfio.c
index acdb0ea..36876dd 100644
--- a/libfio.c
+++ b/libfio.c
@@ -41,8 +41,8 @@
 
 unsigned long arch_flags = 0;
 
-unsigned long page_mask;
-unsigned long page_size;
+uintptr_t page_mask;
+uintptr_t page_size;
 
 static const char *fio_os_strings[os_nr] = {
 	"Invalid",