diff --git a/src/H5PartTypes.h b/src/H5PartTypes.h
index a2b31a5..b11ed97 100644
--- a/src/H5PartTypes.h
+++ b/src/H5PartTypes.h
@@ -34,9 +34,9 @@ struct H5BlockFile;
 struct H5PartFile {
 	hid_t	file;
 	char	*groupname_step;
-	h5part_int64_t	stepno_width;
+	int	stepno_width;
 	int	empty;
-	
+       
 	h5part_int64_t timestep;
 	hsize_t nparticles;