diff --git a/pkgs/development/libraries/flann/default.nix b/pkgs/development/libraries/flann/default.nix
index ec1715b005ff..eeac7d14568e 100644
--- a/pkgs/development/libraries/flann/default.nix
+++ b/pkgs/development/libraries/flann/default.nix
@@ -43,6 +43,12 @@ stdenv.mkDerivation rec {
       url = "https://github.com/flann-lib/flann/commit/25eb56ec78472bd419a121c6905095a793cf8992.patch";
       sha256 = "qt8h576Gn8uR7+T9u9bEBIRz6e6AoTKpa1JfdZVvW9s=";
     })
+  ] ++ lib.optionals stdenv.cc.isClang [
+    # Fix build with Clang 16.
+    (fetchpatch {
+      url = "https://github.com/flann-lib/flann/commit/be80cefa69b314a3d9e1ab971715e84145863ebb.patch";
+      hash = "sha256-4SUKzQCm0Sx8N43Z6ShuMbgbbe7q8b2Ibk3WgkB0qa4=";
+    })
   ];
 
   cmakeFlags = [