Index: uspace/lib/c/generic/async.c
===================================================================
--- uspace/lib/c/generic/async.c	(revision b4df8db46336b1d3a612064e87644b1698115b9c)
+++ uspace/lib/c/generic/async.c	(revision b696cbff4a24376d6e6be1b86817a2cf94bab1e3)
@@ -350,5 +350,5 @@
 static async_client_conn_t client_connection = default_client_connection;
 static async_interrupt_handler_t interrupt_received = default_interrupt_received;
-static size_t interrupt_handler_stksz = (size_t) -1;
+static size_t interrupt_handler_stksz = FIBRIL_DFLT_STK_SIZE;
 
 /** Setter for client_connection function pointer.
@@ -375,5 +375,5 @@
 /** Set the stack size for the interrupt handler notification fibrils.
  *
- * @param size Stack size. Use -1 to use the system default stack size.
+ * @param size Stack size in bytes.
  */
 void async_set_interrupt_handler_stack_size(size_t size)