diff --git a/pkgs/applications/office/wpsoffice/default.nix b/pkgs/applications/office/wpsoffice/default.nix
index 78b559b8ff3f..99c58ba5360d 100644
--- a/pkgs/applications/office/wpsoffice/default.nix
+++ b/pkgs/applications/office/wpsoffice/default.nix
@@ -49,6 +49,7 @@ stdenv.mkDerivation rec {
 
       nativeBuildInputs = [ curl coreutils ];
 
+      impureEnvVars = lib.fetchers.proxyImpureEnvVars;
       SSL_CERT_FILE = "${cacert}/etc/ssl/certs/ca-bundle.crt";
     } ''
     timestamp10=$(date '+%s')