diff --git a/pkgs/by-name/ch/chmlib/package.nix b/pkgs/by-name/ch/chmlib/package.nix
index 28653a09f920..bf05a2c965ac 100644
--- a/pkgs/by-name/ch/chmlib/package.nix
+++ b/pkgs/by-name/ch/chmlib/package.nix
@@ -25,6 +25,7 @@ stdenv.mkDerivation {
   configureFlags = [
     "--enable-examples"
     "--enable-devel"
+    "CFLAGS=-std=gnu17"
   ];
 
   meta = {