diff --git a/sql/field.cc b/sql/field.cc
index 1c937755c0c..ff631edd8d4 100644
--- a/sql/field.cc
+++ b/sql/field.cc
@@ -10231,7 +10231,7 @@ Create_field::Create_field(Field *old_field,Field *orig_field)
     if (length != 4)
     {
       char buff[sizeof("YEAR()") + MY_INT64_NUM_DECIMAL_DIGITS + 1];
-      snprintf(buff, sizeof(buff), "YEAR(%lu)", length);
+      my_snprintf(buff, sizeof(buff), "YEAR(%lu)", length);
       push_warning_printf(current_thd, MYSQL_ERROR::WARN_LEVEL_NOTE,
                           ER_WARN_DEPRECATED_SYNTAX,
                           ER(ER_WARN_DEPRECATED_SYNTAX),
diff --git a/sql/sql_yacc.yy b/sql/sql_yacc.yy
index 854ba432362..7a6981f778a 100644
--- a/sql/sql_yacc.yy
+++ b/sql/sql_yacc.yy
@@ -5042,7 +5042,7 @@ type:
               if (errno == 0 && length <= MAX_FIELD_BLOBLENGTH && length != 4)
               {
                 char buff[sizeof("YEAR()") + MY_INT64_NUM_DECIMAL_DIGITS + 1];
-                snprintf(buff, sizeof(buff), "YEAR(%lu)", length);
+                my_snprintf(buff, sizeof(buff), "YEAR(%lu)", length);
                 push_warning_printf(YYTHD, MYSQL_ERROR::WARN_LEVEL_NOTE,
                                     ER_WARN_DEPRECATED_SYNTAX,
                                     ER(ER_WARN_DEPRECATED_SYNTAX),