Index: libcfa/src/concurrency/io/call.cfa.in
===================================================================
--- libcfa/src/concurrency/io/call.cfa.in	(revision bf0263c9b7b4fb1f0eeb41eb13f2e11fe44991d3)
+++ libcfa/src/concurrency/io/call.cfa.in	(revision 90a812553b6fb7bc8cf5dadc34f305f3df56721e)
@@ -139,4 +139,5 @@
 // I/O Interface
 //=============================================================================================
+#pragma GCC visibility push(default)
 """
 
Index: libcfa/src/concurrency/io/setup.cfa
===================================================================
--- libcfa/src/concurrency/io/setup.cfa	(revision bf0263c9b7b4fb1f0eeb41eb13f2e11fe44991d3)
+++ libcfa/src/concurrency/io/setup.cfa	(revision 90a812553b6fb7bc8cf5dadc34f305f3df56721e)
@@ -26,5 +26,5 @@
 
 #if !defined(CFA_HAVE_LINUX_IO_URING_H)
-	void ?{}(io_context_params & this) {}
+	void ?{}(io_context_params & this) libcfa_public {}
 
 	void  ?{}($io_context & this, struct cluster & cl) {}
@@ -66,5 +66,5 @@
 #pragma GCC diagnostic pop
 
-	void ?{}(io_context_params & this) {
+	void ?{}(io_context_params & this) libcfa_public {
 		this.num_entries = 256;
 	}
Index: libcfa/src/concurrency/io/types.hfa
===================================================================
--- libcfa/src/concurrency/io/types.hfa	(revision bf0263c9b7b4fb1f0eeb41eb13f2e11fe44991d3)
+++ libcfa/src/concurrency/io/types.hfa	(revision 90a812553b6fb7bc8cf5dadc34f305f3df56721e)
@@ -17,4 +17,6 @@
 #pragma once
 
+#include <limits.h>
+
 extern "C" {
 	#include <linux/types.h>
@@ -25,5 +27,4 @@
 #include "iofwd.hfa"
 #include "kernel/fwd.hfa"
-#include "limits.hfa"
 
 #if defined(CFA_HAVE_LINUX_IO_URING_H)
@@ -140,5 +141,5 @@
 		const __u32 tail = *this->cq.tail;
 
-		if(head == tail) return MAX;
+		if(head == tail) return ULLONG_MAX;
 
 		return this->cq.ts;