diff --git a/pkgs/stdenv/generic/make-derivation.nix b/pkgs/stdenv/generic/make-derivation.nix
index 23a77719fa0a..eb8545c6999e 100644
--- a/pkgs/stdenv/generic/make-derivation.nix
+++ b/pkgs/stdenv/generic/make-derivation.nix
@@ -97,7 +97,7 @@ rec {
         {
           name = name + lib.optionalString
             (stdenv.hostPlatform != stdenv.buildPlatform)
-            stdenv.hostPlatform.config;
+            ("-" + stdenv.hostPlatform.config);
           builder = attrs.realBuilder or stdenv.shell;
           args = attrs.args or ["-e" (attrs.builder or ./default-builder.sh)];
           inherit stdenv;