--- eclass/mysql-cmake.eclass
+++ eclass/mysql-cmake.eclass
@@ -239,6 +239,8 @@
 	CMAKE_BUILD_TYPE="RelWithDebInfo"
 
 	mycmakeargs=(
+		-DCMAKE_C_FLAGS_RELWITHDEBINFO="$(usex debug "" "-DNDEBUG")"
+		-DCMAKE_CXX_FLAGS_RELWITHDEBINFO="$(usex debug "" "-DNDEBUG")"
 		-DCMAKE_INSTALL_PREFIX=${EPREFIX}/usr
 		-DMYSQL_DATADIR=${EPREFIX}/var/lib/mysql
 		-DSYSCONFDIR=${EPREFIX}/etc/mysql