diff --git a/R/check_model_diagnostics.R b/R/check_model_diagnostics.R
index 371e32609..46a64f9c2 100644
--- a/R/check_model_diagnostics.R
+++ b/R/check_model_diagnostics.R
@@ -174,10 +174,10 @@
 
   if (inherits(model, "lm", which = TRUE) == 1) {
     cook_levels <- round(stats::qf(0.5, s$fstatistic[2], s$fstatistic[3]), 2)
-  } else if (!is.null(threshold)) {
-    cook_levels <- threshold
-  } else {
+  } else if (is.null(threshold)) {
     cook_levels <- c(0.5, 1)
+  } else {
+    cook_levels <- threshold
   }
 
   n_params <- tryCatch(model$rank, error = function(e) insight::n_parameters(model))