diff --git a/DESCRIPTION b/DESCRIPTION
index b532e8613..b9c45864f 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -91,6 +91,7 @@ Suggests:
     lavaan,
     lme4,
     logspline,
+    marginaleffects,
     MASS,
     mclogit,
     mclust,
diff --git a/tests/testthat/test-plot.estimate_contrasts.R b/tests/testthat/test-plot.estimate_contrasts.R
index b9e88e856..bd9855059 100644
--- a/tests/testthat/test-plot.estimate_contrasts.R
+++ b/tests/testthat/test-plot.estimate_contrasts.R
@@ -1,6 +1,7 @@
 test_that("`plot.see_estimate_contrasts()` works", {
   skip_if_not_installed("rstanarm")
   skip_if_not_installed("emmeans")
+  skip_if_not_installed("marginaleffects")
 
   model <- stan_glm(Sepal.Width ~ Species, data = iris, refresh = 0)
   contrasts <- modelbased::estimate_contrasts(model, contrast = "Species")