diff --git a/pkgs/tools/networking/mosh/default.nix b/pkgs/tools/networking/mosh/default.nix
index 1a2086810724..c83ab66b27a0 100644
--- a/pkgs/tools/networking/mosh/default.nix
+++ b/pkgs/tools/networking/mosh/default.nix
@@ -25,6 +25,8 @@ stdenv.mkDerivation rec {
       wrapProgram $out/bin/mosh --prefix PERL5LIB : $PERL5LIB
   '';
 
+  CXXFLAGS = stdenv.lib.optionalString stdenv.cc.isClang "-std=c++11";
+
   meta = {
     homepage = https://mosh.org/;
     description = "Mobile shell (ssh replacement)";