1 files changed, 1 insertions, 1 deletions
diff --git a/bson/bson-inl.h b/bson/bson-inl.h
index d8221d78df0..00f7ac87212 100644
--- a/bson/bson-inl.h
+++ b/bson/bson-inl.h
@@ -124,7 +124,7 @@ dodouble:
             int lsz = l.objsize(); // our bin data size in bytes, not including the subtype byte
             int rsz = r.objsize();
             if ( lsz - rsz != 0 ) return lsz - rsz;
-            return memcmp(l.value()+4, r.value()+4, lsz+1);
+            return memcmp(l.value()+4, r.value()+4, lsz+1 /*+1 for subtype byte*/);
         }
         case RegEx: {
             int c = strcmp(l.regex(), r.regex());