diff --git a/pkgs/by-name/tr/tree-sitter/grammars/grammar-sources.nix b/pkgs/by-name/tr/tree-sitter/grammars/grammar-sources.nix
index 389abcb572c0..eca7bb54e615 100644
--- a/pkgs/by-name/tr/tree-sitter/grammars/grammar-sources.nix
+++ b/pkgs/by-name/tr/tree-sitter/grammars/grammar-sources.nix
@@ -1026,6 +1026,8 @@
         aciceri
       ];
     };
+    # Slash in grammar name and non-schema top-level `tree-sitter` field
+    excludeBrokenTreeSitterJson = true;
   };
 
   groovy = {