diff --git a/src/mu-threader-utils.c b/src/mu-threader-utils.c
index e6197835..d4dccc71 100644
--- a/src/mu-threader-utils.c
+++ b/src/mu-threader-utils.c
@@ -76,6 +76,7 @@ find_last (Container *c)
 }
 
 
+#if 0
 static gboolean
 check_dup (Container *c, GHashTable *hash)
 {
@@ -103,7 +104,7 @@ assert_no_duplicates (Container *c)
 			
 	g_hash_table_destroy (hash);
 }
-
+#endif
 
 
 Container*
diff --git a/src/mu-threader.c b/src/mu-threader.c
index eb93a5ad..b889d4ec 100644
--- a/src/mu-threader.c
+++ b/src/mu-threader.c
@@ -97,7 +97,7 @@ mu_threader_calculate (MuMsgIter *iter, size_t matchnum)
 }
 
 
-
+#if 0
 
 static void
 check_dup (const char *msgid, Container *c, GHashTable *hash)
@@ -124,7 +124,7 @@ assert_no_duplicates (GHashTable *ids)
 	g_hash_table_destroy (hash);
 }
 
-
+#endif
 
 
 
@@ -142,7 +142,7 @@ find_or_create_referred (GHashTable *id_table, const char *msgid,
 	if (!c) {
 		c = container_new (NULL, 0, msgid);
 		g_hash_table_insert (id_table, (gpointer)msgid, c);
-		assert_no_duplicates (id_table);
+		/* assert_no_duplicates (id_table); */
 	}
 
 	
@@ -187,7 +187,7 @@ find_or_create (GHashTable *id_table, MuMsg *msg, guint docid)
 			c = container_append_children (c, c2);
 			g_hash_table_insert (id_table,
 					     (gpointer)mu_msg_get_path (msg), c2);
-			assert_no_duplicates (id_table);
+			/* assert_no_duplicates (id_table); */
 
 			return NULL; /* don't process this message further */
 		}
@@ -196,7 +196,7 @@ find_or_create (GHashTable *id_table, MuMsg *msg, guint docid)
 		    Message-ID in id_table. */
 		c = container_new (msg, docid, msgid);
 		g_hash_table_insert (id_table, (gpointer)msgid, c);
-		assert_no_duplicates (id_table);
+		/* assert_no_duplicates (id_table); */
 				
 		return c;
 	}