diff --git a/src/backends/mysql/session.cpp b/src/backends/mysql/session.cpp
index 383248c..86a5bfd 100644
--- a/src/backends/mysql/session.cpp
+++ b/src/backends/mysql/session.cpp
@@ -5,6 +5,7 @@
 // (See accompanying file LICENSE_1_0.txt or copy at
 // http://www.boost.org/LICENSE_1_0.txt)
 //
+typedef bool my_bool;
 
 #define SOCI_MYSQL_SOURCE
 #include "soci/mysql/soci-mysql.h"