diff --git a/pkgs/development/compilers/unison/default.nix b/pkgs/development/compilers/unison/default.nix
index 025fc8c3fa7..d027898cf9d 100644
--- a/pkgs/development/compilers/unison/default.nix
+++ b/pkgs/development/compilers/unison/default.nix
@@ -42,6 +42,6 @@ stdenv.mkDerivation rec {
     homepage = "https://unisonweb.org/";
     license = with licenses; [ mit bsd3 ];
     maintainers = [ maintainers.virusdave ];
-    platforms = [ "x86_64-darwin" "x86_64-linux" ];
+    platforms = [ "x86_64-darwin" "x86_64-linux" "aarch64-darwin" ];
   };
 }