diff --git a/guix/build-system/copy.scm b/guix/build-system/copy.scm
index d58931b33c2..cf0214320bf 100644
--- a/guix/build-system/copy.scm
+++ b/guix/build-system/copy.scm
@@ -66,13 +66,13 @@ (define* (lower name
   (bag
     (name name)
     (system system)
-    (host-inputs `(,@(if source
+    (build-inputs `(,@(if source
                          `(("source" ,source))
                          '())
-                   ,@inputs
-                   ;; Keep the standard inputs of 'gnu-build-system'.
-                   ,@(standard-packages)))
-    (build-inputs native-inputs)
+                    ,@native-inputs
+                    ;; Keep the standard inputs of 'gnu-build-system'.
+                    ,@(standard-packages)))
+    (host-inputs inputs)
     (outputs outputs)
     (build copy-build)
     (arguments (strip-keyword-arguments private-keywords arguments))))