diff --git a/src/process_pipeline.c b/src/process_pipeline.c
index f7a0219..6ae7b69 100644
--- a/src/process_pipeline.c
+++ b/src/process_pipeline.c
@@ -1410,7 +1410,7 @@ mp_process_pipeline_process_image(MPBuffer buffer)
 }
 
 static void
-capture()
+capture(struct _MPPipeline *pipeline, const void *data)
 {
 	setup_capture();