diff --git a/pkgs/by-name/lo/log4shib/package.nix b/pkgs/by-name/lo/log4shib/package.nix
index ef90d78fecbd..3b421146e8cb 100644
--- a/pkgs/by-name/lo/log4shib/package.nix
+++ b/pkgs/by-name/lo/log4shib/package.nix
@@ -17,7 +17,7 @@ stdenv.mkDerivation {
 
   nativeBuildInputs = [ autoreconfHook ];
 
-  CXXFLAGS = "-std=c++11";
+  env.CXXFLAGS = "-std=c++11";
 
   meta = {
     description = "Forked version of log4cpp that has been created for the Shibboleth project";