diff --git a/R/mutate.R b/R/mutate.R
index cda8943..bad8aad 100644
--- a/R/mutate.R
+++ b/R/mutate.R
@@ -161,8 +161,7 @@ mutate_df <- function(.data, ...) {
       cond_nms[i] <- names(conditions)[[i]]
       context$.data[[cond_nms[i]]] <- res
     } else {
-      if (is.null(res_nms)) names(res) <- names(conditions)[[i]]
-      context$.data[[names(res)]] <- res
+      context$.data[[names(conditions)[[i]]]] <- res
     }
   }
   list(
diff --git a/inst/tinytest/test_mutate.R b/inst/tinytest/test_mutate.R
index f61e68c..720119b 100644
--- a/inst/tinytest/test_mutate.R
+++ b/inst/tinytest/test_mutate.R
@@ -217,7 +217,7 @@ expect_equal(
 models <- mtcars %>% nest_by(cyl) %>% mutate(model = list(lm(mpg ~ wt, data = data)))
 expect_equal(
   lapply(models$model, class),
-  list(model = "lm", model = "lm", model = "lm"),
+  list("lm", "lm", "lm"),
   info = "List columns can be mutated: 3"
 )