diff --git a/protected/java/src/org/broadinstitute/sting/gatk/walkers/compression/reducereads/SlidingWindow.java b/protected/java/src/org/broadinstitute/sting/gatk/walkers/compression/reducereads/SlidingWindow.java
index 997eca1ed..d55560a70 100644
--- a/protected/java/src/org/broadinstitute/sting/gatk/walkers/compression/reducereads/SlidingWindow.java
+++ b/protected/java/src/org/broadinstitute/sting/gatk/walkers/compression/reducereads/SlidingWindow.java
@@ -696,10 +696,11 @@ public class SlidingWindow {
                                 currentHaplotype++;
                             }
                             LinkedList<HeaderElement> header = read.getReadNegativeStrandFlag() ? headersNegStrand.get(haplotype) : headersPosStrand.get(haplotype);
+                            // add to the polyploid header
                             addToHeader(header, read);
+                            // remove from the standard header so that we don't double count it
+                            removeFromHeader(windowHeader, read);
                         }
-
-                        removeFromHeader(windowHeader, read);
                     }
                 }