diff --git a/gnu/packages/cran.scm b/gnu/packages/cran.scm
index a4fa9d40e0..d73e63f840 100644
--- a/gnu/packages/cran.scm
+++ b/gnu/packages/cran.scm
@@ -4814,6 +4814,8 @@ (define-public r-heatmaply
        ("r-seriation" ,r-seriation)
        ("r-viridis" ,r-viridis)
        ("r-webshot" ,r-webshot)))
+    (native-inputs
+     `(("r-knitr" ,r-knitr)))
     (home-page "https://cran.r-project.org/package=heatmaply")
     (synopsis "Interactive cluster heat maps using plotly")
     (description