diff --git a/fio.h b/fio.h
index 2c8d904..04a9a9a 100644
--- a/fio.h
+++ b/fio.h
@@ -445,6 +445,10 @@
 extern char *num2str(unsigned long, int, int, int, int);
 extern int ioengine_load(struct thread_data *);
 
+extern uintptr_t page_mask;
+extern uintptr_t page_size;
+extern int initialize_fio(char *envp[]);
+
 #define FIO_GETOPT_JOB		0x89000000
 #define FIO_GETOPT_IOENGINE	0x98000000
 #define FIO_NR_OPTIONS		(FIO_MAX_OPTS + 128)