diff --git a/spa/plugins/audioconvert/audioadapter.c b/spa/plugins/audioconvert/audioadapter.c
index 51d87d4e3..801b736ab 100644
--- a/spa/plugins/audioconvert/audioadapter.c
+++ b/spa/plugins/audioconvert/audioadapter.c
@@ -1812,6 +1812,9 @@ impl_node_port_reuse_buffer(void *object, uint32_t port_id, uint32_t buffer_id)
 
 	spa_return_val_if_fail(this != NULL, -EINVAL);
 
+	if (SPA_DIRECTION_OUTPUT != this->direction)
+		port_id++;
+
 	return spa_node_port_reuse_buffer(this->target, port_id, buffer_id);
 }
 
diff --git a/spa/plugins/videoconvert/videoadapter.c b/spa/plugins/videoconvert/videoadapter.c
index e324b49de..fe50413aa 100644
--- a/spa/plugins/videoconvert/videoadapter.c
+++ b/spa/plugins/videoconvert/videoadapter.c
@@ -1779,6 +1779,9 @@ impl_node_port_reuse_buffer(void *object, uint32_t port_id, uint32_t buffer_id)
 
 	spa_return_val_if_fail(this != NULL, -EINVAL);
 
+	if (SPA_DIRECTION_OUTPUT != this->direction)
+		port_id++;
+
 	return spa_node_port_reuse_buffer(this->target, port_id, buffer_id);
 }