diff --git a/ds/number.c b/ds/number.c
index 667e9c8..459e9df 100644
--- a/ds/number.c
+++ b/ds/number.c
@@ -528,7 +528,7 @@ static size_t number_data_size(const struct b_number_p *number)
 	}
 }
 
-static void print_inf(const struct b_number_p *n, struct b_stream *out)
+static void print_inf(const struct b_number_p *n, b_stream *out)
 {
 	switch (n->n_type) {
 	case B_NUMBER_INT8:
@@ -583,7 +583,7 @@ static void print_inf(const struct b_number_p *n, struct b_stream *out)
 	b_stream_write_string(out, "INF", NULL);
 }
 
-static void print_nan(const struct b_number_p *n, struct b_stream *out)
+static void print_nan(const struct b_number_p *n, b_stream *out)
 {
 	switch (n->n_type) {
 	case B_NUMBER_INT8:
@@ -796,7 +796,7 @@ static void number_fini(b_object *obj, void *priv)
 	struct b_number_p *number = priv;
 }
 
-static void number_to_string(const b_object *obj, struct b_stream *out)
+static void number_to_string(const b_object *obj, b_stream *out)
 {
 	struct b_number_p *number = b_object_get_private(obj, B_TYPE_NUMBER);