diff --git a/pkgs/by-name/ci/civetweb/package.nix b/pkgs/by-name/ci/civetweb/package.nix
index 07c61d26a4e3..6736b11090e8 100644
--- a/pkgs/by-name/ci/civetweb/package.nix
+++ b/pkgs/by-name/ci/civetweb/package.nix
@@ -57,6 +57,9 @@ stdenv.mkDerivation (finalAttrs: {
     #
     # [1] https://github.com/civetweb/civetweb/blob/cafd5f8fae3b859b7f8c29feb03ea075c7221497/CMakeLists.txt#L56
     "-DCIVETWEB_THREAD_STACK_SIZE=0"
+
+    # Workaround CMake 4 compat
+    (lib.cmakeFeature "CMAKE_POLICY_VERSION_MINIMUM" "3.5")
   ];
 
   meta = {