1 files changed, 2 insertions, 2 deletions

diff --git a/src/font.h b/src/font.h
index b2d7e49fa29..940eb3d001d 100644
--- a/src/font.h
+++ b/src/font.h
@@ -823,8 +823,8 @@ extern void *font_get_frame_data (FRAME_PTR f,
 
 extern void font_filter_properties (Lisp_Object font,
                                     Lisp_Object alist,
-                                    const char *boolean_properties[],
-                                    const char *non_boolean_properties[]);
+                                    const char *const boolean_properties[],
+                                    const char *const non_boolean_properties[]);
 
 #ifdef HAVE_FREETYPE
 extern struct font_driver ftfont_driver;