diff --git a/include/transport/MySQLBackend.h b/include/transport/MySQLBackend.h
index 5c9eb19770d9eedaa5c7345ba8b017ee2558627b..46a1d108bf91333927ed8cc131e2d853421e4fcf 100644
--- a/include/transport/MySQLBackend.h
+++ b/include/transport/MySQLBackend.h
@@ -127,9 +127,9 @@ class MySQLBackend : public StorageBackend
 				MYSQL *m_conn;
 				std::vector<MYSQL_BIND> m_params;
 				std::vector<MYSQL_BIND> m_results;
-				int m_resultOffset;
-				int m_offset;
 				int m_error;
+				unsigned m_resultOffset;
+				unsigned m_offset;
 				std::string m_string;
 		};