diff --git a/packages/solo5/default.nix b/packages/solo5/default.nix
index b080618..50d3ac8 100644
--- a/packages/solo5/default.nix
+++ b/packages/solo5/default.nix
@@ -32,6 +32,8 @@ in stdenv.mkDerivation {
     runHook postConfigure
   '';
 
+  makeFlags = "CXXFLAGS=-Wno-mismatched-tags";
+
   installPhase = ''
     runHook preInstall
     mkdir -p $out/bin $tests/bin