diff --git a/desktop/browser_window.c b/desktop/browser_window.c
index 6defe0182..2b0e3143a 100644
--- a/desktop/browser_window.c
+++ b/desktop/browser_window.c
@@ -4644,7 +4644,7 @@ browser_window__reload_current_parameters(struct browser_window *bw)
 
 /* Exported interface, documented in browser_window.h */
 browser_window_page_info_state browser_window_get_page_info_state(
-	struct browser_window *bw)
+		const struct browser_window *bw)
 {
 	lwc_string *scheme;
 	bool match;
diff --git a/include/netsurf/browser_window.h b/include/netsurf/browser_window.h
index e8faa1877..eb2bd7c6b 100644
--- a/include/netsurf/browser_window.h
+++ b/include/netsurf/browser_window.h
@@ -774,7 +774,7 @@ nserror browser_window_console_log(struct browser_window *bw,
  * \return The state of the browser window
  */
 browser_window_page_info_state browser_window_get_page_info_state(
-	struct browser_window *bw);
+		const struct browser_window *bw);
 
 /**
  * Request the current browser window SSL certificate chain.