diff --git a/pkgs/by-name/ca/catch2_3/clang-20-disable-broken-test.patch b/pkgs/by-name/ca/catch2_3/clang-20-disable-broken-test.patch
new file mode 100644
index 000000000000..372243455aed
--- /dev/null
+++ b/pkgs/by-name/ca/catch2_3/clang-20-disable-broken-test.patch
@@ -0,0 +1,15 @@
+diff --git a/tests/SelfTest/UsageTests/Misc.tests.cpp b/tests/SelfTest/UsageTests/Misc.tests.cpp
+index 3697f0695c..8c10aace7b 100644
+--- a/tests/SelfTest/UsageTests/Misc.tests.cpp
++++ b/tests/SelfTest/UsageTests/Misc.tests.cpp
+@@ -384,10 +384,6 @@
+     REQUIRE(x.size() > 0);
+ }
+ 
+-TEMPLATE_PRODUCT_TEST_CASE("Product with differing arities", "[template][product]", std::tuple, (int, (int, double), (int, double, float))) {
+-    REQUIRE(std::tuple_size<TestType>::value >= 1);
+-}
+-
+ using MyTypes = std::tuple<int, char, float>;
+ TEMPLATE_LIST_TEST_CASE("Template test case with test types specified inside std::tuple", "[template][list]", MyTypes)
+ {
diff --git a/pkgs/by-name/ca/catch2_3/package.nix b/pkgs/by-name/ca/catch2_3/package.nix
index 58cb11c64144..269a445c48a4 100644
--- a/pkgs/by-name/ca/catch2_3/package.nix
+++ b/pkgs/by-name/ca/catch2_3/package.nix
@@ -18,6 +18,12 @@ stdenv.mkDerivation rec {
     hash = "sha256-eeqqzHMeXLRiXzbY+ay8gJ/YDuxDj3f6+d6eXA1uZHE=";
   };
 
+  patches = lib.optionals stdenv.cc.isClang [
+    # This test fails to compile with Clang 20
+    # See: https://github.com/catchorg/Catch2/issues/2991
+    ./clang-20-disable-broken-test.patch
+  ];
+
   postPatch = ''
     substituteInPlace CMake/*.pc.in \
       --replace-fail "\''${prefix}/" ""