diff --git a/libisoburn/isoburn.h b/libisoburn/isoburn.h
index f6ec32ca..2f72f50e 100644
--- a/libisoburn/isoburn.h
+++ b/libisoburn/isoburn.h
@@ -134,7 +134,7 @@ int isoburn_set_start_byte(struct isoburn *o, off_t value, int flag);
             data_source_free() function. Note that that doesn't release the
             drive.
 */
-static struct data_source *
+struct data_source *
 isoburn_data_source_new(struct burn_drive *d);
 
 #endif /* Isoburn_includeD */