--- brltty-5.0/Programs/async_io.c.orig	2014-01-27 19:39:26.000000000 +0100
+++ brltty-5.0/Programs/async_io.c	2014-02-16 16:27:20.807854232 +0100
@@ -193,7 +193,7 @@
 logOperation (const OperationEntry *operation, void *callback) {
   logSymbol(LOG_CATEGORY(ASYNC_EVENTS),
             callback,
-            operation->function->methods->functionName);
+            "%s", operation->function->methods->functionName);
 }
 
 #ifdef __MINGW32__