diff --git a/plugins/by-name/otter/default.nix b/plugins/by-name/otter/default.nix
index a27f7dd0..b9a6aa9c 100644
--- a/plugins/by-name/otter/default.nix
+++ b/plugins/by-name/otter/default.nix
@@ -87,7 +87,7 @@ lib.nixvim.plugins.mkNeovimPlugin {
           inherit (config.plugins) treesitter;
           highlightEnabled = treesitter.highlight.enable || (treesitter.settings.highlight.enable or false);
         in
-        config.plugins.treesitter.enable -> highlightEnabled == null;
+        !(treesitter.enable && highlightEnabled);
 
       message = ''
         You have enabled otter, but treesitter syntax highlighting is not enabled.
diff --git a/tests/test-sources/plugins/by-name/otter/default.nix b/tests/test-sources/plugins/by-name/otter/default.nix
index 8ba902df..040ee57a 100644
--- a/tests/test-sources/plugins/by-name/otter/default.nix
+++ b/tests/test-sources/plugins/by-name/otter/default.nix
@@ -61,4 +61,28 @@
       };
     };
   };
+
+  warning-no-highlight = {
+    test.runNvim = false;
+    test.warnings = expect: [
+      (expect "count" 1)
+      (expect "any" "You have enabled otter, but treesitter syntax highlighting is not enabled.")
+    ];
+    plugins = {
+      otter.enable = true;
+      treesitter.enable = true;
+    };
+  };
+
+  warning-no-treesitter = {
+    test.runNvim = false;
+    test.warnings = expect: [
+      (expect "count" 1)
+      (expect "any" "You have enabled otter, but treesitter syntax highlighting is not enabled.")
+    ];
+    plugins = {
+      otter.enable = true;
+      treesitter.highlight.enable = true;
+    };
+  };
 }