diff --git a/src/queue.c b/src/queue.c
index 66429a4c56e5706aa43eb6c4fb383a22425c0700..105a3969249b3256f8139aa1353203d2003fb388 100644
--- a/src/queue.c
+++ b/src/queue.c
@@ -118,9 +118,9 @@ void queue_insert ( struct queue *q , struct task *t ) {
         } */
             
     /* Verify queue consistency. */
-    /* for ( int k = 1 ; k < q->count ; k++ )
+    for ( int k = 1 ; k < q->count ; k++ )
         if ( q->tasks[ q->tid[(k-1)/2] ].weight < q->tasks[ q->tid[k] ].weight )
-            error( "Queue not heaped." ); */
+            error( "Queue not heaped." );
     
     /* Unlock the queue. */
     if ( lock_unlock( &q->lock ) != 0 )
@@ -269,9 +269,9 @@ struct task *queue_gettask ( struct queue *q , int qid , int blocking ) {
                 } */
                 
             /* Verify queue consistency. */
-            /* for ( k = 1 ; k < q->count ; k++ )
+            for ( k = 1 ; k < q->count ; k++ )
                 if ( q->tasks[ q->tid[(k-1)/2] ].weight < q->tasks[ q->tid[k] ].weight )
-                    error( "Queue not heaped." ); */
+                    error( "Queue not heaped." );
     
             }
         else
diff --git a/src/scheduler.c b/src/scheduler.c
index 468d4f75adcb8e4f34233a82e8b6d251f16b3afb..66708fb14ca4ac6014502771bc1029659b889b9e 100644
--- a/src/scheduler.c
+++ b/src/scheduler.c
@@ -563,7 +563,7 @@ void scheduler_start ( struct scheduler *s , unsigned int mask ) {
     // #pragma omp parallel for schedule(static) private(t,j)
     for ( k = s->nr_tasks-1 ; k >= 0 ; k-- ) {
         t = &tasks[ tid[k] ];
-        if ( !( (1 << t->type) & mask ) || !t->skip )
+        if ( !( (1 << t->type) & mask ) || t->skip )
             continue;
         for ( j = 0 ; j < t->nr_unlock_tasks ; j++ )
             atomic_inc( &t->unlock_tasks[j]->wait );