diff --git a/pkgs/stdenv/generic/make-derivation.nix b/pkgs/stdenv/generic/make-derivation.nix
index 952b8b66c10c..bd7410515f38 100644
--- a/pkgs/stdenv/generic/make-derivation.nix
+++ b/pkgs/stdenv/generic/make-derivation.nix
@@ -570,11 +570,14 @@ let
   checkedEnv =
     let
       overlappingNames = attrNames (builtins.intersectAttrs env derivationArg);
+      prettyPrint = lib.generators.toPretty {};
+      makeError = name: "  - ${name}: in `env`: ${prettyPrint env.${name}}; in derivation arguments: ${prettyPrint derivationArg.${name}}";
+      errors = lib.concatMapStringsSep "\n" makeError overlappingNames;
     in
     assert assertMsg envIsExportable
       "When using structured attributes, `env` must be an attribute set of environment variables.";
     assert assertMsg (overlappingNames == [ ])
-      "The ‘env’ attribute set cannot contain any attributes passed to derivation. The following attributes are overlapping: ${concatStringsSep ", " overlappingNames}";
+      "The ‘env’ attribute set cannot contain any attributes passed to derivation. The following attributes are overlapping:\n${errors}";
     mapAttrs
       (n: v: assert assertMsg (isString v || isBool v || isInt v || isDerivation v)
         "The ‘env’ attribute set can only contain derivation, string, boolean or integer attributes. The ‘${n}’ attribute is of type ${builtins.typeOf v}."; v)