diff --git a/sql/sys_vars.ic b/sql/sys_vars.ic
index b92867f98e1..ffd08608e19 100644
--- a/sql/sys_vars.ic
+++ b/sql/sys_vars.ic
@@ -341,6 +341,8 @@ public:
                       substitute)
   {
     option.var_type|= GET_ENUM;
+    option.min_value= 0;
+    option.max_value= ULONG_MAX;
     global_var(ulong)= def_val;
     if ((option.u_max_value= (uchar**)max_var_ptr()))
     {
@@ -1349,6 +1351,8 @@ public:
                       substitute)
   {
     option.var_type|= GET_SET;
+    option.min_value= 0;
+    option.max_value= ~0ULL;
     global_var(ulonglong)= def_val;
     if ((option.u_max_value= (uchar**)max_var_ptr()))
     {