diff --git a/include/picrin.h b/include/picrin.h
index 83663fa7..fea544d7 100644
--- a/include/picrin.h
+++ b/include/picrin.h
@@ -5,6 +5,6 @@ typedef struct {
 } pic_state;
 
 pic_state *pic_open();
-void pic_close(pic_state *pic);
+void pic_close(pic_state *);
 
 #endif