diff --git a/gtk/gtkcsscolorvalue.c b/gtk/gtkcsscolorvalue.c
index 4868c87ba8..bbeea9dede 100644
--- a/gtk/gtkcsscolorvalue.c
+++ b/gtk/gtkcsscolorvalue.c
@@ -1789,6 +1789,8 @@ gtk_css_color_value_parse (GtkCssParser *parser)
     {
       ColorFunctionData data = { NULL, };
 
+      gtk_css_parser_warn_deprecated (parser, "lighter() is deprecated");
+
       if (gtk_css_parser_consume_function (parser, 1, 1, parse_color_number, &data))
         value = gtk_css_color_value_new_shade (data.color, 1.3);
       else
@@ -1801,6 +1803,8 @@ gtk_css_color_value_parse (GtkCssParser *parser)
     {
       ColorFunctionData data = { NULL, };
 
+      gtk_css_parser_warn_deprecated (parser, "darker() is deprecated");
+
       if (gtk_css_parser_consume_function (parser, 1, 1, parse_color_number, &data))
         value = gtk_css_color_value_new_shade (data.color, 0.7);
       else
@@ -1813,6 +1817,8 @@ gtk_css_color_value_parse (GtkCssParser *parser)
     {
       ColorFunctionData data = { NULL, };
 
+      gtk_css_parser_warn_deprecated (parser, "shade() is deprecated");
+
       if (gtk_css_parser_consume_function (parser, 2, 2, parse_color_number, &data))
         value = gtk_css_color_value_new_shade (data.color, data.value);
       else
@@ -1825,6 +1831,8 @@ gtk_css_color_value_parse (GtkCssParser *parser)
     {
       ColorFunctionData data = { NULL, };
 
+      gtk_css_parser_warn_deprecated (parser, "alpha() is deprecated");
+
       if (gtk_css_parser_consume_function (parser, 2, 2, parse_color_number, &data))
         value = gtk_css_color_value_new_alpha (data.color, data.value);
       else
@@ -1837,6 +1845,8 @@ gtk_css_color_value_parse (GtkCssParser *parser)
     {
       ColorFunctionData data = { NULL, };
 
+      gtk_css_parser_warn_deprecated (parser, "mix() is deprecated");
+
       if (gtk_css_parser_consume_function (parser, 3, 3, parse_legacy_mix, &data))
         value = gtk_css_color_value_new_mix (data.color, data.color2, data.value);
       else