diff --git a/pkgs/development/tools/analysis/valkyrie/default.nix b/pkgs/development/tools/analysis/valkyrie/default.nix
index 1da6c6a1e86..a0ff2059369 100644
--- a/pkgs/development/tools/analysis/valkyrie/default.nix
+++ b/pkgs/development/tools/analysis/valkyrie/default.nix
@@ -8,7 +8,16 @@ stdenv.mkDerivation rec {
     sha256 = "0hwvsncf62mdkahwj9c8hpmm94c1wr5jn89370k6rj894kxry2x7";
   };
 
+  patchPhase = ''
+    sed -i '1s;^;#include <unistd.h>\n;' src/objects/tool_object.cpp
+    sed -i '1s;^;#include <unistd.h>\n;' src/utils/vk_config.cpp
+    sed -i '1s;^;#include <sys/types.h>\n;' src/utils/vk_config.cpp
+    sed -i '1s;^;#include <unistd.h>\n;' src/utils/vk_utils.cpp
+    sed -i '1s;^;#include <sys/types.h>\n;' src/utils/vk_utils.cpp
+  '';
+
   buildInputs = [ qt4 ];
+
   nativeBuildInputs = [ qmake4Hook ];
 
   meta = {
@@ -16,6 +25,5 @@ stdenv.mkDerivation rec {
     description = "Qt4-based GUI for the Valgrind 3.6.x series";
     license = stdenv.lib.licenses.gpl2;
     platforms = stdenv.lib.platforms.linux;
-    broken = true;
   };
 }