diff --git a/include/decl.h b/include/decl.h
index 6d4bef737..9a9fcc099 100644
--- a/include/decl.h
+++ b/include/decl.h
@@ -752,6 +752,7 @@ struct instance_globals_o {
     boolean opt_need_redraw; /* for doset() */
     boolean opt_need_glyph_reset;
     boolean opt_need_promptstyle;
+    boolean opt_reset_customizations;
 
     /* pickup.c */
     int oldcap; /* last encumbrance */
diff --git a/include/extern.h b/include/extern.h
index 2d99f5add..67620e010 100644
--- a/include/extern.h
+++ b/include/extern.h
@@ -1110,6 +1110,8 @@ extern void apply_customizations(enum graphics_sets which_set);
 extern void purge_custom_entries(enum graphics_sets which_set);
 extern void purge_all_custom_entries(void);
 extern void dump_glyphids(void);
+extern void clear_all_glyphmap_colors(void);
+extern void reset_customizations(void);
 
 /* ### hack.c ### */
 
@@ -3031,7 +3033,6 @@ extern const struct symparse *match_sym(char *) NONNULLARG1;
 extern void savedsym_free(void);
 extern void savedsym_strbuf(strbuf_t *) NONNULLARG1;
 extern boolean parsesymbols(char *, int) NONNULLARG1;
-extern void clear_all_glyphmap_colors(void);
 
 /* ### sys.c ### */
 
diff --git a/include/flag.h b/include/flag.h
index 04bf482e2..0bff96054 100644
--- a/include/flag.h
+++ b/include/flag.h
@@ -375,6 +375,7 @@ struct instance_flags {
     boolean fireassist;      /* autowield launcher when using fire-command */
     boolean wizweight;       /* display weight of everything in wizard mode */
     boolean wizmgender;      /* test gender info from core in window port */
+    boolean customcolors;    /* support customcolors defined in glyphmap */
     /*
      * Window capability support.
      */
diff --git a/include/optlist.h b/include/optlist.h
index 51f5bbaa4..81d2b626a 100644
--- a/include/optlist.h
+++ b/include/optlist.h
@@ -250,6 +250,9 @@ static int optfn_##a(int, int, boolean, char *, char *);
                 No, Yes, No, No, NoAlias,
                 "load curses display symbols into symset")
 #endif
+    NHOPTB(customcolors, Map, 0, opt_out, set_in_game,
+           On, Yes, No, No, "customcolours", &iflags.customcolors,
+           Term_False, "use custom colors in map")
     NHOPTB(dark_room, Advanced, 0, opt_out, set_in_game,
            On, Yes, No, No, NoAlias, &flags.dark_room, Term_False,
            "show floor outside line of sight differently")
diff --git a/src/decl.c b/src/decl.c
index 0bef158d7..a90d140a7 100644
--- a/src/decl.c
+++ b/src/decl.c
@@ -655,6 +655,7 @@ static const struct instance_globals_o g_init_o = {
     FALSE, /* opt_need_redraw */
     FALSE, /* opt_need_glyph_reset */
     FALSE, /* opt_need_promptstyle */
+    FALSE, /* opt_reset_customizations */
     /* pickup.c */
     0,  /* oldcap */
     /* restore.c */
diff --git a/src/glyphs.c b/src/glyphs.c
index 07917ae68..e8e741db0 100644
--- a/src/glyphs.c
+++ b/src/glyphs.c
@@ -474,10 +474,12 @@ apply_customizations(enum graphics_sets which_set)
                                          details->content.urep.u.utf8str);
                 }
 #endif
-                if (sc->custtype == custom_nhcolor) {
-                    gmap = &glyphmap[details->content.ccolor.glyphidx];
-                    (void) set_map_nhcolor(gmap,
-                                           details->content.ccolor.nhcolor);
+                if (iflags.customcolors) {
+                    if (sc->custtype == custom_nhcolor) {
+                        gmap = &glyphmap[details->content.ccolor.glyphidx];
+                        (void) set_map_nhcolor(gmap,
+                                               details->content.ccolor.nhcolor);
+                    }
                 }
                 details = details->next;
             }
@@ -1033,6 +1035,25 @@ parse_id(const char *id, struct find_struct *findwhat)
     return 0;
 }
 
+/* extern glyph_map glyphmap[MAX_GLYPH]; */
+
+void
+clear_all_glyphmap_colors(void)
+{
+    int glyph;
+
+    for (glyph = 0; glyph < MAX_GLYPH; ++glyph) {
+        if (glyphmap[glyph].customcolor)
+            glyphmap[glyph].customcolor = 0;
+    }
+}
+
+void reset_customizations(void)
+{
+    clear_all_glyphmap_colors();
+    apply_customizations(gc.currentgraphics);
+}
+
 /* not used yet */
 
 #if 0
diff --git a/src/options.c b/src/options.c
index 6b4ee4f60..68e63e529 100644
--- a/src/options.c
+++ b/src/options.c
@@ -5229,6 +5229,9 @@ optfn_boolean(
             go.opt_need_redraw = TRUE;
             go.opt_need_glyph_reset = TRUE;
             break;
+        case opt_customcolors:
+            go.opt_reset_customizations = TRUE;
+            break;
         case opt_menucolors:
         case opt_guicolor:
             update_inventory();
@@ -8389,6 +8392,7 @@ doset_simple_menu(void)
 
     go.opt_need_redraw = FALSE;
     go.opt_need_glyph_reset = FALSE;
+    go.opt_reset_customizations = FALSE;
     pick_cnt = select_menu(tmpwin, PICK_ONE, &pick_list);
     /* note:  without the complication of a preselected entry, a PICK_ONE
        menu returning pick_cnt > 0 implies exactly 1 */
@@ -8479,7 +8483,11 @@ doset_simple(void)
         }
         if (go.opt_need_promptstyle)
             adjust_menu_promptstyle(WIN_INVEN, &iflags.menu_headings);
-/*
+        if (go.opt_reset_customizations) {
+            reset_customizations();
+            docrt_flags(opt_crt_flags);
+        }
+        /*
  *      I don't think the status window requires updating between
  *      simplemenu iterations.
         if (disp.botl || disp.botlx) {
@@ -8729,6 +8737,10 @@ doset(void) /* changing options via menu by Per Liboriussen */
     if (go.opt_need_glyph_reset) {
         reset_glyphmap(gm_optionchange);
     }
+    if (go.opt_reset_customizations) {
+        reset_customizations();
+        docrt();
+    }
     if (go.opt_need_redraw) {
         check_gold_symbol();
         reglyph_darkroom();
diff --git a/src/symbols.c b/src/symbols.c
index ec3e305a2..2e9a0650a 100644
--- a/src/symbols.c
+++ b/src/symbols.c
@@ -1094,19 +1094,6 @@ do_symset(boolean rogueflag)
     return TRUE;
 }
 
-extern glyph_map glyphmap[MAX_GLYPH];
-
-void
-clear_all_glyphmap_colors(void)
-{
-    int glyph;
-
-    for (glyph = 0; glyph < MAX_GLYPH; ++glyph) {
-        if (glyphmap[glyph].customcolor)
-            glyphmap[glyph].customcolor = 0;
-    }
-}
-
 RESTORE_WARNING_FORMAT_NONLITERAL
 
 /*symbols.c*/