Index: libcfa/src/concurrency/io.cfa
===================================================================
--- libcfa/src/concurrency/io.cfa	(revision 6ddef36750abc1c69002b08f99e2656c46da4150)
+++ libcfa/src/concurrency/io.cfa	(revision 0351e9f1e5c3fe891d91f323ca0e444084c78b16)
@@ -502,5 +502,5 @@
 	}
 
-	#if !defined(IO_URING_IDLE)
+	#if defined(IO_URING_IDLE)
 		bool __kernel_read(processor * proc, io_future_t & future, char buf[], int fd) {
 			$io_context * ctx = proc->io.ctx;