diff --git a/src/lib/mysql/mysql_constants.h b/src/lib/mysql/mysql_constants.h
index ba0908907f..76e9703ad7 100644
--- a/src/lib/mysql/mysql_constants.h
+++ b/src/lib/mysql/mysql_constants.h
@@ -27,6 +27,9 @@ const my_bool MLM_FALSE = 0;
 const my_bool MLM_TRUE = 1;
 
 #else
+///@brief check for bool size
+static_assert(sizeof(bool) == 1, "unsupported bool size");
+
 /// @brief my_bool type in MySQL 8.x.
 typedef bool my_bool;