diff --git a/plugins/languages/rust/rustaceanvim/default.nix b/plugins/languages/rust/rustaceanvim/default.nix
index a269f894..5bce6dad 100644
--- a/plugins/languages/rust/rustaceanvim/default.nix
+++ b/plugins/languages/rust/rustaceanvim/default.nix
@@ -56,6 +56,16 @@ helpers.neovim-plugin.mkNeovimPlugin {
 
         globals.rustaceanvim = cfg.settings;
 
+        assertions = [
+          {
+            assertion = cfg.enable -> !config.plugins.lsp.servers.rust-analyzer.enable;
+            message = ''
+              Nixvim (plugins.rustaceanvim): Both `plugins.rustaceanvim.enable` and `plugins.lsp.servers.rust-analyzer.enable` are true.
+              Disable one of them otherwise you will have multiple clients attached to each buffer.
+            '';
+          }
+        ];
+
         # TODO: remove after 24.11
         warnings =
           optional