diff --git a/modules/plugins/languages/csharp.nix b/modules/plugins/languages/csharp.nix
index 20e5bd72..ef973301 100644
--- a/modules/plugins/languages/csharp.nix
+++ b/modules/plugins/languages/csharp.nix
@@ -178,7 +178,7 @@ in {
 
       treesitter = {
         enable = mkEnableOption "C# treesitter" // {default = config.vim.languages.enableTreesitter;};
-        package = mkGrammarOption pkgs "c-sharp";
+        package = mkGrammarOption pkgs "c_sharp";
       };
 
       lsp = {
diff --git a/modules/plugins/languages/markdown.nix b/modules/plugins/languages/markdown.nix
index 59615cec..feb3f2a5 100644
--- a/modules/plugins/languages/markdown.nix
+++ b/modules/plugins/languages/markdown.nix
@@ -63,7 +63,7 @@ in {
         description = "Enable Markdown treesitter";
       };
       mdPackage = mkGrammarOption pkgs "markdown";
-      mdInlinePackage = mkGrammarOption pkgs "markdown-inline";
+      mdInlinePackage = mkGrammarOption pkgs "markdown_inline";
     };
 
     lsp = {