diff --git a/conf/modules.config b/conf/modules.config
index 917f26c0..3cbb23bb 100644
--- a/conf/modules.config
+++ b/conf/modules.config
@@ -138,10 +138,13 @@ process {
         }
 
         withName: "^.*CRAM_CALL_GENOTYPE_GATK4:CRAM_CALL_GATK4:GATK4_HAPLOTYPECALLER\$" {
-            time        = { 16.h  * task.attempt }
+            cpus        = { 8    * task.attempt }
+            memory      = { 8.GB * task.attempt }
+            time        = { 16.h * task.attempt }
             ext.prefix  = {"${meta.id}.g"}
             ext.args    = {
                 [
+                    "--native-pair-hmm-threads ${task.cpus}",
                     '-ERC GVCF -contamination "0"',
                     '-GQB 10 -GQB 20 -GQB 30 -GQB 40 -GQB 50 -GQB 60 -GQB 70 -GQB 80 -GQB 90',
                     '-G StandardAnnotation -G StandardHCAnnotation -G AS_StandardAnnotation',