Index: libcfa/src/concurrency/io/call.cfa.in
===================================================================
--- libcfa/src/concurrency/io/call.cfa.in	(revision e71e94afb7e0016d752678b114b94246be5a4680)
+++ libcfa/src/concurrency/io/call.cfa.in	(revision 767a8efb6cd2f46125b4b2bf0c84393ab2eddcfd)
@@ -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 e71e94afb7e0016d752678b114b94246be5a4680)
+++ libcfa/src/concurrency/io/setup.cfa	(revision 767a8efb6cd2f46125b4b2bf0c84393ab2eddcfd)
@@ -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;
 	}