diff --git a/lib/ace/mode/dockerfile_highlight_rules.js b/lib/ace/mode/dockerfile_highlight_rules.js
index 3ea8c088..c94ed650 100644
--- a/lib/ace/mode/dockerfile_highlight_rules.js
+++ b/lib/ace/mode/dockerfile_highlight_rules.js
@@ -42,7 +42,7 @@ var DockerfileHighlightRules = function() {
         if (startRules[i].token == "variable.language") {
             startRules.splice(i, 0, {
                 token: "constant.language",
-                regex: "(?:^(?:FROM|MAINTAINER|RUN|CMD|EXPOSE|ENV|ADD|ENTRYPOINT|VOLUME|USER|WORKDIR|ONBUILD)\\b)",
+                regex: "(?:^(?:FROM|MAINTAINER|RUN|CMD|EXPOSE|ENV|ADD|ENTRYPOINT|VOLUME|USER|WORKDIR|ONBUILD|COPY)\\b)",
                 caseInsensitive: true
             });
             break;