diff --git a/gatk.wdl b/gatk.wdl
index 09de0488fd44542fc91a3546387d0a207cf90858..700a245c94a1808b1150a859aedad6dbb4c88d2a 100644
--- a/gatk.wdl
+++ b/gatk.wdl
@@ -1574,7 +1574,7 @@ task VariantEval {
         String memory = "5G"
         String javaXmx = "4G"
         # TODO: Refine estimate. For now 4 minutes per GB of input.
-        Int timeMinutes = ceil(size(flatten([evalVcfs, comparisonVcfs]), "G") * 4)
+        Int timeMinutes = ceil(size(flatten([evalVcfs, comparisonVcfs, select_all([referenceFasta, dbsnpVCF])]), "G") * 4)
         String dockerImage = "quay.io/biocontainers/gatk4:4.1.7.0--py38_0"
     }