diff --git a/include/drivers/io/io_driver.h b/include/drivers/io/io_driver.h
index 2b704f4..d8bb435 100644
--- a/include/drivers/io/io_driver.h
+++ b/include/drivers/io/io_driver.h
@@ -39,7 +39,7 @@
 	io_type_t (*type)(void);
 	int (*open)(io_dev_info_t *dev_info, const uintptr_t spec,
 			io_entity_t *entity);
-	int (*seek)(io_entity_t *entity, int mode, ssize_t offset);
+	int (*seek)(io_entity_t *entity, int mode, signed long long offset);
 	int (*size)(io_entity_t *entity, size_t *length);
 	int (*read)(io_entity_t *entity, uintptr_t buffer, size_t length,
 			size_t *length_read);
diff --git a/include/drivers/io/io_storage.h b/include/drivers/io/io_storage.h
index 084c67c..d40a828 100644
--- a/include/drivers/io/io_storage.h
+++ b/include/drivers/io/io_storage.h
@@ -86,7 +86,7 @@
 /* Synchronous operations */
 int io_open(uintptr_t dev_handle, const uintptr_t spec, uintptr_t *handle);
 
-int io_seek(uintptr_t handle, io_seek_mode_t mode, ssize_t offset);
+int io_seek(uintptr_t handle, io_seek_mode_t mode, signed long long offset);
 
 int io_size(uintptr_t handle, size_t *length);