diff --git a/gnu/packages/gnupg.scm b/gnu/packages/gnupg.scm
index 7bc46ab3e7..d6ca78e209 100644
--- a/gnu/packages/gnupg.scm
+++ b/gnu/packages/gnupg.scm
@@ -645,6 +645,8 @@ passphrase when @code{gpg} or @code{gpg2} is run and needs it.")))
     (inputs
      `(("qtbase" ,qtbase)
        ,@(package-inputs pinentry-tty)))
+    (arguments
+     `(#:configure-flags '("CXXFLAGS=-std=gnu++11")))
   (description
    "Pinentry provides a console and a Qt GUI that allows users to enter a
 passphrase when @code{gpg} or @code{gpg2} is run and needs it.")))