diff --git a/java/src/org/broadinstitute/sting/playground/gatk/walkers/poolseq/PowerBelowFrequencyWalker.java b/java/src/org/broadinstitute/sting/playground/gatk/walkers/poolseq/PowerBelowFrequencyWalker.java
index 72e02aa27..651117cf6 100644
--- a/java/src/org/broadinstitute/sting/playground/gatk/walkers/poolseq/PowerBelowFrequencyWalker.java
+++ b/java/src/org/broadinstitute/sting/playground/gatk/walkers/poolseq/PowerBelowFrequencyWalker.java
@@ -152,7 +152,7 @@ public class PowerBelowFrequencyWalker extends LocusWalker<Integer,Integer> {
     }
 
     private double getSNPProportion(int alleles) {
-        return ((double)alleles)/numIndividuals;
+        return ((double)alleles)/(2*numIndividuals);
     }