diff --git a/pkgs/by-name/li/libmpcdec/package.nix b/pkgs/by-name/li/libmpcdec/package.nix
index b7613dc2ab94..55d33a2327f9 100644
--- a/pkgs/by-name/li/libmpcdec/package.nix
+++ b/pkgs/by-name/li/libmpcdec/package.nix
@@ -13,6 +13,9 @@ stdenv.mkDerivation rec {
     sha256 = "1a0jdyga1zfi4wgkg3905y6inghy3s4xfs5m4x7pal08m0llkmab";
   };
 
+  # needed for cross builds
+  configureFlags = [ "ac_cv_func_memcmp_working=yes" ];
+
   meta = {
     description = "Musepack SV7 decoder library";
     platforms = lib.platforms.unix;