diff --git a/java/src/org/broadinstitute/sting/gatk/walkers/genotyper/DiploidGenotypePriors.java b/java/src/org/broadinstitute/sting/gatk/walkers/genotyper/DiploidGenotypePriors.java
index 4a8483b40..be8ca8316 100755
--- a/java/src/org/broadinstitute/sting/gatk/walkers/genotyper/DiploidGenotypePriors.java
+++ b/java/src/org/broadinstitute/sting/gatk/walkers/genotyper/DiploidGenotypePriors.java
@@ -216,8 +216,8 @@ public class DiploidGenotypePriors {
         double pHet    = heterozygosity2HetProbability(heterozyosity);
         double pHomVar = heterozygosity2HomVarProbability(heterozyosity);
 
-        if ((pHomRef + pHet + pHomVar) != 1) {
-            throw new RuntimeException(String.format("Prior probabilities don't sum to one => %f, %f, %f", pHomRef, pHet, pHomVar));
+        if (MathUtils.compareDoubles(pHomRef + pHet + pHomVar, 1.0) != 0) {
+            throw new RuntimeException(String.format("BUG: Prior probabilities don't sum to one => %f, %f, %f", pHomRef, pHet, pHomVar));
         }
 
         double[] priors = new double[DiploidGenotype.values().length];
@@ -288,4 +288,4 @@ public class DiploidGenotypePriors {
             flatPriors[g.ordinal()] = Math.log10(1.0 / DiploidGenotype.values().length);
         }
     }
-}
\ No newline at end of file
+}