diff --git a/gnu/packages/cran.scm b/gnu/packages/cran.scm
index e9f490f80f..312c46aac8 100644
--- a/gnu/packages/cran.scm
+++ b/gnu/packages/cran.scm
@@ -37333,7 +37333,7 @@ incremented as outlined at @url{http://semver.org}.")
             r-semver
             r-xml2
             r-yaml))
-    (native-inputs (list r-knitr))
+    (native-inputs (list r-knitr r-testthat))
     (home-page "https://github.com/ropensci/binman")
     (synopsis "Binary download manager")
     (description