diff --git a/pkgs/development/tools/parsing/bison/3.x.nix b/pkgs/development/tools/parsing/bison/3.x.nix
index 8e7d65b81ff..ee007414017 100644
--- a/pkgs/development/tools/parsing/bison/3.x.nix
+++ b/pkgs/development/tools/parsing/bison/3.x.nix
@@ -8,7 +8,7 @@ stdenv.mkDerivation rec {
     sha256 = "b67fd2daae7a64b5ba862c66c07c1addb9e6b1b05c5f2049392cfd8a2172952e";
   };
 
-  nativeBuildInputs = [ m4 perl help2man ];
+  nativeBuildInputs = [ m4 perl ] ++ stdenv.lib.optional stdenv.isSunOS help2man;
   propagatedBuildInputs = [ m4 ];
 
   meta = {