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-rw-r--r--gnu/packages/pdf.scm2
1 files changed, 1 insertions, 1 deletions
diff --git a/gnu/packages/pdf.scm b/gnu/packages/pdf.scm
index fb7fd3d2fe..643d21b3d0 100644
--- a/gnu/packages/pdf.scm
+++ b/gnu/packages/pdf.scm
@@ -906,7 +906,7 @@ converter using the Poppler and Cairo libraries.")
             #t))
          (replace 'check
            (lambda _
-             (zero? (system* "python" "-m" "unittest" "Tests.tests")))))))
+             (invoke "python" "-m" "unittest" "Tests.tests"))))))
     (home-page "http://mstamy2.github.com/PyPDF2")
     (synopsis "Pure Python PDF toolkit")
     (description "PyPDF2 is a pure Python PDF library capable of: