diff --git a/CommandLines.h b/CommandLines.h
index 56f23d5..d7e753b 100644
--- a/CommandLines.h
+++ b/CommandLines.h
@@ -3,7 +3,7 @@
 
 #include <pthread.h>
 
-#define HA_VERSION "0.13-r333-dirty"
+#define HA_VERSION "0.13-r334-dirty"
 
 #define VERBOSE 0
 
diff --git a/sketch.cpp b/sketch.cpp
index f053073..72f9d39 100644
--- a/sketch.cpp
+++ b/sketch.cpp
@@ -67,7 +67,8 @@ static void select_mz(ha_mz1_v *p, int len, int sample_dist)
 				}
 				//ks_heapsort_mz(k, b); // sorting is not needed for now
 				for (j = 0; j < k; ++j)
-					p->a[b[j].pos].rid = 0;
+					if (b[j].rid < pe - ps)
+						p->a[b[j].pos].rid = 0;
 			}
 			last0 = i;
 		}