diff --git a/pkgs/by-name/pw/pwgen/package.nix b/pkgs/by-name/pw/pwgen/package.nix
index ae8d6c42187c..3477eaf3f229 100644
--- a/pkgs/by-name/pw/pwgen/package.nix
+++ b/pkgs/by-name/pw/pwgen/package.nix
@@ -20,6 +20,8 @@ stdenv.mkDerivation (finalAttrs: {
     autoreconfHook
   ];
 
+  configureFlags = [ "CFLAGS=-std=gnu17" ];
+
   meta = {
     description = "Password generator which creates passwords which can be easily memorized by a human";
     homepage = "https://github.com/tytso/pwgen";