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-rw-r--r--pkgs/top-level/impure.nix5
1 files changed, 3 insertions, 2 deletions
diff --git a/pkgs/top-level/impure.nix b/pkgs/top-level/impure.nix
index da288f15d2e..3ba6c08a140 100644
--- a/pkgs/top-level/impure.nix
+++ b/pkgs/top-level/impure.nix
@@ -85,6 +85,7 @@ import ./. (builtins.removeAttrs args [ "system" "platform" ] // {
   inherit config overlays crossSystem crossOverlays;
   # Fallback: Assume we are building packages on the current (build, in GNU
   # Autotools parlance) system.
-  localSystem = (if args ? localSystem then {}
-                 else { system = builtins.currentSystem; }) // localSystem;
+  localSystem = if builtins.isString localSystem then localSystem
+                else (if args ? localSystem then {}
+                      else { system = builtins.currentSystem; }) // localSystem;
 })