diff --git a/clients/lsp-nix.el b/clients/lsp-nix.el
index 19d847f5c6..b50b40c659 100644
--- a/clients/lsp-nix.el
+++ b/clients/lsp-nix.el
@@ -56,7 +56,7 @@
 
 (lsp-register-client
  (make-lsp-client :new-connection (lsp-stdio-connection (lambda () lsp-nix-nixd-server-path))
-                  :major-modes '(nix-mode)
+                  :major-modes '(nix-mode nix-ts-mode)
                   :server-id 'nixd-lsp
                   :priority -1))
 
diff --git a/lsp-mode.el b/lsp-mode.el
index 2c4b1827e8..0ed4c219f4 100644
--- a/lsp-mode.el
+++ b/lsp-mode.el
@@ -938,7 +938,7 @@ Changes take effect only when a new session is started."
     (robot-mode . "robot")
     (racket-mode . "racket")
     (nix-mode . "nix")
-    (nix-ts-mode . "Nix")
+    (nix-ts-mode . "nix")
     (prolog-mode . "prolog")
     (vala-mode . "vala")
     (actionscript-mode . "actionscript")