1 files changed, 6 insertions, 5 deletions

diff --git a/apps/plugins/puzzles/src/nullfe.c b/apps/plugins/puzzles/src/nullfe.c
index ad381a135b..14b6e096c0 100644
--- a/apps/plugins/puzzles/src/nullfe.c
+++ b/apps/plugins/puzzles/src/nullfe.c
@@ -10,7 +10,7 @@
 
 void frontend_default_colour(frontend *fe, float *output) {}
 void draw_text(drawing *dr, int x, int y, int fonttype, int fontsize,
-               int align, int colour, char *text) {}
+               int align, int colour, const char *text) {}
 void draw_rect(drawing *dr, int x, int y, int w, int h, int colour) {}
 void draw_line(drawing *dr, int x1, int y1, int x2, int y2, int colour) {}
 void draw_thick_line(drawing *dr, float thickness,
@@ -41,15 +41,16 @@ int print_rgb_hatched_colour(drawing *dr, float r, float g, float b, int hatch)
 { return 0; }
 void print_line_width(drawing *dr, int width) {}
 void print_line_dotted(drawing *dr, int dotted) {}
-void midend_supersede_game_desc(midend *me, char *desc, char *privdesc) {}
-void status_bar(drawing *dr, char *text) {}
+void midend_supersede_game_desc(midend *me, const char *desc,
+                                const char *privdesc) {}
+void status_bar(drawing *dr, const char *text) {}
 struct preset_menu *preset_menu_new(void) {return NULL;}
 struct preset_menu *preset_menu_add_submenu(struct preset_menu *parent,
                                             char *title) {return NULL;}
 void preset_menu_add_preset(struct preset_menu *parent,
                             char *title, game_params *params) {}
 
-void fatal(char *fmt, ...)
+void fatal(const char *fmt, ...)
 {
     va_list ap;
 
@@ -64,7 +65,7 @@ void fatal(char *fmt, ...)
 }
 
 #ifdef DEBUGGING
-void debug_printf(char *fmt, ...)
+void debug_printf(const char *fmt, ...)
 {
     va_list ap;
     va_start(ap, fmt);