diff --git a/conf/modules/gens_pon.config b/conf/modules/gens_pon.config
index 734d754..8ebd6cb 100644
--- a/conf/modules/gens_pon.config
+++ b/conf/modules/gens_pon.config
@@ -53,7 +53,7 @@ process {
 
     withName: '.*GENS_PON:GATK4_CREATEREADCOUNTPANELOFNORMALS' {
         ext.args   = { ["--minimum-interval-median-percentile ${params.gens_min_interval_median_percentile}",
-                        "--maximum-chunk-size ${params.maximum_chunk_size}"].join(" ")}
+                        "--maximum-chunk-size ${params.gens_maximum_chunk_size}"].join(" ")}
         publishDir = [
                 mode: params.publish_dir_mode,
                 path: { "${params.outdir}/gens_pon/createreadcountpanelofnormals" },