diff --git a/sql/mdl.h b/sql/mdl.h
index 124151798ae..2fb21a5aa18 100644
--- a/sql/mdl.h
+++ b/sql/mdl.h
@@ -15,6 +15,14 @@
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
 
+#if defined(__IBMC__) || defined(__IBMCPP__)
+/* Further down, "next_in_lock" and "next_in_context" have the same type,
+   and in "sql_plist.h" this leads to an identical signature, which causes
+   problems in function overloading.
+*/
+#pragma namemangling(v5)
+#endif
+
 
 #include "sql_plist.h"
 #include <my_sys.h>