diff --git a/gnu/packages/cran.scm b/gnu/packages/cran.scm
index 46784abeaa..dd8755d109 100644
--- a/gnu/packages/cran.scm
+++ b/gnu/packages/cran.scm
@@ -33202,7 +33202,7 @@ classification and regression models.")
                              r-patchwork
                              r-pbapply
                              r-rlang))
-    (native-inputs (list r-knitr))
+    (native-inputs (list r-knitr r-testthat))
     (home-page "https://github.com/zachmayer/caretEnsemble")
     (synopsis "Ensembles of caret models")
     (description