diff --git a/pkgs/development/compilers/llvm/11/openmp.nix b/pkgs/development/compilers/llvm/11/openmp.nix
index 86e3faee0909..c99358cd2878 100644
--- a/pkgs/development/compilers/llvm/11/openmp.nix
+++ b/pkgs/development/compilers/llvm/11/openmp.nix
@@ -1,6 +1,7 @@
 { lib
 , stdenv
 , fetch
+, fetchpatch
 , cmake
 , llvm
 , perl
@@ -13,6 +14,15 @@ stdenv.mkDerivation rec {
 
   src = fetch pname "0bh5cswgpc79awlq8j5i7hp355adaac7s6zaz0zwp6mkflxli1yi";
 
+  patches = [
+    # Fix compilation on aarch64-darwin, remove after the next release.
+    (fetchpatch {
+      url = "https://github.com/llvm/llvm-project/commit/7b5254223acbf2ef9cd278070c5a84ab278d7e5f.patch";
+      sha256 = "sha256-A+9/IVIoazu68FK5H5CiXcOEYe1Hpp4xTx2mIw7m8Es=";
+      stripLen = 1;
+    })
+  ];
+
   nativeBuildInputs = [ cmake perl ];
   buildInputs = [ llvm ];