diff --git a/workflow/apps/r/calculate_interaction_zscores5.R b/workflow/apps/r/calculate_interaction_zscores5.R
index 4b35d257..718815af 100644
--- a/workflow/apps/r/calculate_interaction_zscores5.R
+++ b/workflow/apps/r/calculate_interaction_zscores5.R
@@ -196,7 +196,7 @@ calculate_summary_stats <- function(df, variables, group_vars = c("conc_num", "c
       # z_max = ~ifelse(sd(., na.rm = TRUE) == 0 | all(is.na(.)), NA,
       #   (max(., na.rm = TRUE) - mean(., na.rm = TRUE)) / sd(., na.rm = TRUE))  # Z-score
     ), .names = "{.fn}_{.col}")) %>%
-    mutate(N = ~sum(!is.na(L))) # count of non-NA L values
+    mutate(N = sum(!is.na(L))) # count of non-NA L values
 
   # Join the summary stats back to the original dataframe
   df_with_stats <- left_join(df, summary_stats, by = group_vars)