diff --git a/pkgs/applications/blockchains/bitcoin-classic/default.nix b/pkgs/applications/blockchains/bitcoin-classic/default.nix
index 8aacb50a1b5..4a0a99e288a 100644
--- a/pkgs/applications/blockchains/bitcoin-classic/default.nix
+++ b/pkgs/applications/blockchains/bitcoin-classic/default.nix
@@ -46,6 +46,8 @@ stdenv.mkDerivation rec {
     "--with-qt-bindir=${qtbase.dev}/bin:${qttools.dev}/bin"
   ];
 
+  CXXFLAGS = [ "-std=c++14" ];
+
   enableParallelBuilding = true;
 
   dontWrapQtApps = true;