diff --git a/src/H5PartPrivate.h b/src/H5PartPrivate.h
index 2e2d47c..10279cb 100644
--- a/src/H5PartPrivate.h
+++ b/src/H5PartPrivate.h
@@ -21,6 +21,12 @@ struct _iter_op_data {
 	char *pattern;
 };
 
+static h5part_int64_t
+_H5Part_set_step (
+	H5PartFile *f,
+	const h5part_int64_t step
+	);
+
 h5part_int64_t
 _H5Part_get_num_particles (
 	H5PartFile *f