diff --git a/gatk.wdl b/gatk.wdl
index ff33b44c10328f4d9705d1a6e0993a7c0978ce90..be3b4d3f559152d1c125719b7ab601595813429d 100644
--- a/gatk.wdl
+++ b/gatk.wdl
@@ -436,7 +436,7 @@ task FilterMutectCalls {
         String? extraArgs
 
         Int memory = 8
-        Float memoryMultiplier = 2
+        Float memoryMultiplier = 1.5
         String dockerImage = "quay.io/biocontainers/gatk4:4.1.2.0--1"
     }