diff --git a/libmaxsi/decl/FILE.h b/libmaxsi/decl/FILE.h
index 6ab5fd24..1dd4d458 100644
--- a/libmaxsi/decl/FILE.h
+++ b/libmaxsi/decl/FILE.h
@@ -15,7 +15,7 @@ typedef struct _FILE
 	size_t (*read_func)(void* ptr, size_t size, size_t nmemb, void* user);
 	size_t (*write_func)(const void* ptr, size_t size, size_t nmemb, void* user);
 	int (*seek_func)(void* user, off_t offset, int whence);
-	long (*tell_func)(void* user);
+	off_t (*tell_func)(void* user);
 	void (*clearerr_func)(void* user);
 	int (*eof_func)(void* user);
 	int (*error_func)(void* user);
diff --git a/libmaxsi/fdio.c b/libmaxsi/fdio.c
index fed7bf7d..9d213442 100644
--- a/libmaxsi/fdio.c
+++ b/libmaxsi/fdio.c
@@ -28,6 +28,7 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include <errno.h>
+#include "fdio.h"
 
 const int FDIO_WRITING = (1<<0);
 const int FDIO_READING = (1<<1);