diff --git a/build-aux/check-final-inputs-self-contained.scm b/build-aux/check-final-inputs-self-contained.scm
index a6148d12e33..dffdbcf49cf 100644
--- a/build-aux/check-final-inputs-self-contained.scm
+++ b/build-aux/check-final-inputs-self-contained.scm
@@ -50,7 +50,7 @@
                                       directory))
                                  ((_ . directory) directory))
                                (derivation->output-paths drv)))))
-              %final-inputs))
+              (%final-inputs system)))
 
 (define (assert-valid-substitute substitute)
   "Make sure SUBSTITUTE does not refer to any bootstrap inputs, and bail out