diff --git a/NEWS.md b/NEWS.md
index b2bc9ade..b223f663 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,5 +1,6 @@
 # bayesplot (development version)
 
+* Fix assignment-in-call bug in `mcmc_rank_ecdf()` (#).
 * Replaced deprecated `dplyr` and `tidyselect` functions (`top_n`, `one_of`, `group_indices`) with their modern equivalents to ensure future compatibility. (#431)
 * Documentation added for all exported `*_data()` functions (#209)
 * Improved documentation for `binwidth`, `bins`, and `breaks` arguments to clarify they are passed to `ggplot2::geom_area()` and `ggdist::stat_dots()` in addition to `ggplot2::geom_histogram()`
diff --git a/R/mcmc-traces.R b/R/mcmc-traces.R
index cad857ae..21252085 100644
--- a/R/mcmc-traces.R
+++ b/R/mcmc-traces.R
@@ -515,7 +515,7 @@ mcmc_rank_ecdf <-
     } else {
       K
     },
-    L <- n_chain
+    L = n_chain
   )
   data_lim <- data.frame(
     upper = lims$upper / n_iter - (plot_diff == TRUE) * x,