diff --git a/osc.h b/osc.h
index 1a40116b..0820a8fc 100644
--- a/osc.h
+++ b/osc.h
@@ -3,5 +3,5 @@
 #include <stdbool.h>
 #include "terminal.h"
 
-bool osc_ensure_size(struct terminal *term, size_t size);
+bool osc_ensure_size(struct terminal *term, size_t required_size);
 void osc_dispatch(struct terminal *term);