diff --git a/pkgs/development/tools/rust/cargo-modules/default.nix b/pkgs/development/tools/rust/cargo-modules/default.nix
index 5ef0168383c5..691661f595c4 100644
--- a/pkgs/development/tools/rust/cargo-modules/default.nix
+++ b/pkgs/development/tools/rust/cargo-modules/default.nix
@@ -22,6 +22,9 @@ rustPlatform.buildRustPackage rec {
     description = "A cargo plugin for showing a tree-like overview of a crate's modules";
     homepage = "https://github.com/regexident/cargo-modules";
     license = with licenses; [ mpl20 ];
+    # all tests fail with:
+    # thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: "tests run with disabled concurrency, automatic snapshot name generation is not supported.  Consider using the \"backtrace\" feature of insta which tries to recover test names from the call stack."', /private/tmp/nix-build-cargo-modules-0.5.6.drv-0/cargo-modules-0.5.6-vendor.tar.gz/insta/src/runtime.rs:908:22
+    broken = (stdenv.isDarwin && stdenv.isx86_64);
     maintainers = with maintainers; [ figsoda rvarago ];
   };
 }