diff --git a/cxx/clean_relation.hh b/cxx/clean_relation.hh
index e9e1757..a4256b6 100644
--- a/cxx/clean_relation.hh
+++ b/cxx/clean_relation.hh
@@ -391,12 +391,8 @@ class CleanRelation : public Relation<T> {
 
   void set_cluster_assignment_gibbs(const Domain& domain, const T_item& item,
                                     int table, std::mt19937* prng) {
-    int table_current = domain.get_cluster_assignment(item);
-    if (table == table_current) {
-      printf("table %d == table_current in set_cluster_assignment_gibbs\n",
-             table);
-      assert(false);
-    }
+    [[maybe_unused]] int table_current = domain.get_cluster_assignment(item);
+    assert(table != table_current);
     for (const T_items& items : data_r.at(domain.name).at(item)) {
       ValueType x = data.at(items);
       // Remove from current cluster.