Index: src/OFDeflateStream.m
==================================================================
--- src/OFDeflateStream.m
+++ src/OFDeflateStream.m
@@ -732,13 +732,14 @@
 
 		break;
 #undef CTX
 	}
 
-	assert(0);
+	/* Get rid of a warning, never reached anyway */
+	OF_ENSURE(0);
 }
 
 - (bool)lowlevelIsAtEndOfStream
 {
 	return _atEndOfStream;
 }
 @end

Index: src/OFRunLoop.m
==================================================================
--- src/OFRunLoop.m
+++ src/OFRunLoop.m
@@ -389,11 +389,11 @@
 - (void)streamIsReadyForReading: (OFStream*)stream
 {
 	OFList *queue = [_readQueues objectForKey: stream];
 	of_list_object_t *listObject;
 
-	OF_ENSURE(queue != nil);
+	assert(queue != nil);
 
 	listObject = [queue firstListObject];
 
 	if ([listObject->object isKindOfClass:
 	    [OFRunLoop_ReadQueueItem class]]) {
@@ -612,11 +612,11 @@
 			}
 # ifdef OF_HAVE_BLOCKS
 		}
 # endif
 	} else
-		OF_ENSURE(0);
+		assert(0);
 }
 #endif
 
 - (void)run
 {