diff --git a/met/scripts/Rscripts/plot_tcmpr.R b/met/scripts/Rscripts/plot_tcmpr.R
index f42ba17c94..cad729c484 100644
--- a/met/scripts/Rscripts/plot_tcmpr.R
+++ b/met/scripts/Rscripts/plot_tcmpr.R
@@ -377,7 +377,7 @@ if(length(file_list) == 0) {
 }
 
 # Expand any wildcards in the input file list
-file_list = system(paste("ls -1", paste(file_list, collapse=" ")),
+file_list = system(paste("ls -1d", paste(file_list, collapse=" ")),
                    intern=TRUE);
 
 # Read the plotting configuration file, if specified