diff --git a/pkgs/applications/science/misc/root/5.nix b/pkgs/applications/science/misc/root/5.nix
index 40a5412e7af..84443645865 100644
--- a/pkgs/applications/science/misc/root/5.nix
+++ b/pkgs/applications/science/misc/root/5.nix
@@ -104,6 +104,7 @@ stdenv.mkDerivation rec {
     "-Drpath=ON"
     "-DCMAKE_INSTALL_LIBDIR=lib"
     "-DCMAKE_INSTALL_INCLUDEDIR=include"
+    "-DCMAKE_CXX_FLAGS=-std=c++11"
     "-Dalien=OFF"
     "-Dbonjour=OFF"
     "-Dcastor=OFF"