diff --git a/include/mapnik/css_color_grammar_x3_def.hpp b/include/mapnik/css_color_grammar_x3_def.hpp
index 7f32d0219..220523e85 100644
--- a/include/mapnik/css_color_grammar_x3_def.hpp
+++ b/include/mapnik/css_color_grammar_x3_def.hpp
@@ -101,6 +101,7 @@ struct named_colors_ : x3::symbols<color>
             ("darksalmon", color(233, 150, 122))
             ("darkseagreen", color(143, 188, 143))
             ("darkslateblue", color(72, 61, 139))
+            ("darkslategray", color(47, 79, 79))
             ("darkslategrey", color(47, 79, 79))
             ("darkturquoise", color(0, 206, 209))
             ("darkviolet", color(148, 0, 211))
@@ -118,9 +119,9 @@ struct named_colors_ : x3::symbols<color>
             ("gold", color(255, 215, 0))
             ("goldenrod", color(218, 165, 32))
             ("gray", color(128, 128, 128))
-            ("grey", color(128, 128, 128))
             ("green", color(0, 128, 0))
             ("greenyellow", color(173, 255, 47))
+            ("grey", color(128, 128, 128))
             ("honeydew", color(240, 255, 240))
             ("hotpink", color(255, 105, 180))
             ("indianred", color(205, 92, 92))
@@ -183,6 +184,7 @@ struct named_colors_ : x3::symbols<color>
             ("plum", color(221, 160, 221))
             ("powderblue", color(176, 224, 230))
             ("purple", color(128, 0, 128))
+            ("rebeccapurple", color(102, 51, 153))
             ("red", color(255, 0, 0))
             ("rosybrown", color(188, 143, 143))
             ("royalblue", color(65, 105, 225))