diff --git a/pkgs/development/compilers/colm/default.nix b/pkgs/development/compilers/colm/default.nix
index 3a3670279c62..f9dc99ee2f8f 100644
--- a/pkgs/development/compilers/colm/default.nix
+++ b/pkgs/development/compilers/colm/default.nix
@@ -22,6 +22,7 @@ stdenv.mkDerivation rec {
     description = "A programming language for the analysis and transformation of computer languages";
     homepage = http://www.colm.net/open-source/colm;
     license = licenses.gpl2;
+    platforms = platforms.unix;
     maintainers = with maintainers; [ pSub ];
   };
 }