diff --git a/pkgs/tools/security/pinentry/qt5.nix b/pkgs/tools/security/pinentry/qt5.nix
index 18648633a09..375187a5146 100644
--- a/pkgs/tools/security/pinentry/qt5.nix
+++ b/pkgs/tools/security/pinentry/qt5.nix
@@ -31,6 +31,8 @@ stdenv.mkDerivation rec {
     (mkEnable true "pinentry-qt")
   ];
 
+  NIX_CFLAGS_COMPILE = [ "-std=c++11" ];
+
   nativeBuildInputs = [ pkgconfig ];
 
   meta = {