Index: libcfa/src/concurrency/io/setup.cfa
===================================================================
--- libcfa/src/concurrency/io/setup.cfa	(revision 90a812553b6fb7bc8cf5dadc34f305f3df56721e)
+++ libcfa/src/concurrency/io/setup.cfa	(revision 2af1943b18ac4e55038b91f4d588ca5ca58bf5c7)
@@ -346,5 +346,5 @@
 	}
 
-	void ^?{}( $io_arbiter & this ) {}
+	void ^?{}( $io_arbiter & mutex this ) {}
 
 	$io_arbiter * create(void) {
Index: libcfa/src/concurrency/io/types.hfa
===================================================================
--- libcfa/src/concurrency/io/types.hfa	(revision 90a812553b6fb7bc8cf5dadc34f305f3df56721e)
+++ libcfa/src/concurrency/io/types.hfa	(revision 2af1943b18ac4e55038b91f4d588ca5ca58bf5c7)
@@ -125,5 +125,5 @@
 
 
-	struct __attribute__((aligned(128))) $io_context {
+	struct __attribute__((aligned(64))) $io_context {
 		$io_arbiter * arbiter;
 		processor * proc;
@@ -153,5 +153,5 @@
 	};
 
-	struct __attribute__((aligned(128))) $io_arbiter {
+	monitor __attribute__((aligned(64))) $io_arbiter {
 		__outstanding_io_queue pending;
 	};