--- OpenCL/OpenCL.xs	2012/04/25 21:48:45	1.56
+++ OpenCL/OpenCL.xs	2012/04/28 13:31:40	1.57
@@ -603,7 +603,7 @@
         RETVAL
 
 const char *
-err2str (cl_int err)
+err2str (cl_int err = res)
 
 const char *
 enum2str (cl_uint value)