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-rw-r--r--guix/gexp.scm3
-rw-r--r--tests/gexp.scm7
2 files changed, 9 insertions, 1 deletions
diff --git a/guix/gexp.scm b/guix/gexp.scm
index 1f64cf75ae..1e26342101 100644
--- a/guix/gexp.scm
+++ b/guix/gexp.scm
@@ -319,7 +319,8 @@ references."
       (_
        result)))
 
-  (add-reference-output (gexp-references exp) '()))
+  (delete-duplicates
+   (add-reference-output (gexp-references exp) '())))
 
 (define* (gexp->sexp exp #:key
                      (system (%current-system))
diff --git a/tests/gexp.scm b/tests/gexp.scm
index 2ec6c8e3ef..783ca2cdbc 100644
--- a/tests/gexp.scm
+++ b/tests/gexp.scm
@@ -230,6 +230,13 @@
                 (gexp-outputs exp2))
          (= 2 (length (gexp-outputs exp2))))))
 
+(test-equal "output list, combined gexps, duplicate output"
+  1
+  (let* ((exp0 (gexp (mkdir (ungexp output))))
+         (exp1 (gexp (begin (mkdir (ungexp output)) (ungexp exp0))))
+         (exp2 (gexp (begin (mkdir (ungexp output)) (ungexp exp1)))))
+    (length (gexp-outputs exp2))))
+
 (test-assert "output list + ungexp-splicing list, combined gexps"
   (let* ((exp0  (gexp (mkdir (ungexp output))))
          (exp1  (gexp (mkdir (ungexp output "foo"))))