diff --git a/pkgs/tools/archivers/unrar/default.nix b/pkgs/tools/archivers/unrar/default.nix
index 0fe8f2f58665..62fd02ac56d7 100644
--- a/pkgs/tools/archivers/unrar/default.nix
+++ b/pkgs/tools/archivers/unrar/default.nix
@@ -22,6 +22,8 @@ stdenv.mkDerivation rec {
     make lib
   '';
 
+  outputs = [ "out" "dev" ];
+
   installPhase = ''
     install -Dt "$out/bin" unrar
 
@@ -30,7 +32,8 @@ stdenv.mkDerivation rec {
         $out/share/doc/unrar
 
     install -Dm755 libunrar.so $out/lib/libunrar.so
-    install -D dll.hpp $out/include/unrar/dll.hpp
+
+    install -Dt $dev/include/unrar/ *.hpp
   '';
 
   setupHook = ./setup-hook.sh;