diff --git a/gnu/packages/bioinformatics.scm b/gnu/packages/bioinformatics.scm
index 6c71d82c96..8398ef2b88 100644
--- a/gnu/packages/bioinformatics.scm
+++ b/gnu/packages/bioinformatics.scm
@@ -1735,7 +1735,7 @@ (define-public r-streamgraph
              r-magrittr
              r-tidyr
              r-xts))
-      (native-inputs (list r-knitr))
+      (native-inputs (list r-knitr r-testthat))
       (home-page "https://github.com/hrbrmstr/streamgraph")
       (synopsis "Htmlwidget for building streamgraph visualizations")
       (description