diff --git a/static/languages/_groups.json b/static/languages/_groups.json
index 1ba46f654..23e897a65 100644
--- a/static/languages/_groups.json
+++ b/static/languages/_groups.json
@@ -172,7 +172,7 @@
     "languages": [
       "code_python",
       "code_c",
-      "code_c#",
+      "code_csharp",
       "code_c++",
       "code_javascript",
       "code_javascript_1k",
diff --git a/static/languages/_list.json b/static/languages/_list.json
index f9634d418..6e394bda1 100644
--- a/static/languages/_list.json
+++ b/static/languages/_list.json
@@ -85,7 +85,7 @@
   ,"pig_latin"
   ,"code_python"
   ,"code_c"
-  ,"code_c#"
+  ,"code_csharp"
   ,"code_c++"
   ,"code_javascript"
   ,"code_javascript_1k"
diff --git a/static/languages/code_c#.json b/static/languages/code_csharp.json
similarity index 100%
rename from static/languages/code_c#.json
rename to static/languages/code_csharp.json