diff --git a/backends/mysql/src/mysql_parameter_binder.cpp b/backends/mysql/src/mysql_parameter_binder.cpp
index ab1242d..655fa8a 100644
--- a/backends/mysql/src/mysql_parameter_binder.cpp
+++ b/backends/mysql/src/mysql_parameter_binder.cpp
@@ -90,6 +90,7 @@ void bind_value(enum_field_types type, const char *value, size_t, MYSQL_BIND &bi
 
 mysql_parameter_binder::mysql_parameter_binder(size_t size)
 : bind_params_(size)
+, is_null_vector(size)
 , info_(size)
 {}