diff --git a/pkgs/by-name/su/superlu/package.nix b/pkgs/by-name/su/superlu/package.nix
index 6b2455c92f37..13c8a51830ca 100644
--- a/pkgs/by-name/su/superlu/package.nix
+++ b/pkgs/by-name/su/superlu/package.nix
@@ -34,6 +34,11 @@ stdenv.mkDerivation (finalAttrs: {
     })
   ];
 
+  # Prevent clang from crashing when compiling slatms.c from SuperLU’s matgen test code.
+  postPatch = lib.optionalString stdenv.cc.isClang ''
+    echo 'target_compile_options(matgen PRIVATE -fno-vectorize)' >> TESTING/MATGEN/CMakeLists.txt
+  '';
+
   nativeBuildInputs = [
     cmake
     ninja