diff --git a/sql/item_timefunc.cc b/sql/item_timefunc.cc
index 8a1bd0be291..b208713eea0 100644
--- a/sql/item_timefunc.cc
+++ b/sql/item_timefunc.cc
@@ -153,14 +153,17 @@ longlong Item_func_month::val_int()
 
 String* Item_func_monthname::val_str(String* str)
 {
-  uint month=(uint) Item_func_month::val_int();
+  uint   month=(uint) Item_func_month::val_int();
   if (!month)					// This is also true for NULL
   {
     null_value=1;
     return (String*) 0;
   }
   null_value=0;
-  return &month_names[month-1];
+  
+  String *m=&month_names[month-1];
+  str->copy(m->ptr(), m->length(), m->charset(), thd_charset());
+  return str;
 }
 
 // Returns the quarter of the year
@@ -234,7 +237,10 @@ String* Item_func_dayname::val_str(String* str)
   uint weekday=(uint) val_int();		// Always Item_func_daynr()
   if (null_value)
     return (String*) 0;
-  return &day_names[weekday];
+  
+  String *d=&day_names[weekday];
+  str->copy(d->ptr(), d->length(), d->charset(), thd_charset());
+  return str;
 }
 
 
diff --git a/sql/item_timefunc.h b/sql/item_timefunc.h
index de2860d24ef..c3dc9bfb6d4 100644
--- a/sql/item_timefunc.h
+++ b/sql/item_timefunc.h
@@ -85,7 +85,12 @@ public:
   const char *func_name() const { return "monthname"; }
   String *val_str(String *str);
   enum Item_result result_type () const { return STRING_RESULT; }
-  void fix_length_and_dec() { decimals=0; max_length=10; maybe_null=1; }
+  void fix_length_and_dec() 
+  { 
+    decimals=0; 
+    max_length=10*thd_charset()->mbmaxlen;
+    maybe_null=1; 
+  }
 };
 
 
@@ -192,7 +197,12 @@ class Item_func_dayname :public Item_func_weekday
   const char *func_name() const { return "dayname"; }
   String *val_str(String *str);
   enum Item_result result_type () const { return STRING_RESULT; }
-  void fix_length_and_dec() { decimals=0; max_length=9; maybe_null=1; }
+  void fix_length_and_dec() 
+  { 
+    decimals=0; 
+    max_length=9*thd_charset()->mbmaxlen;
+    maybe_null=1; 
+  }
 };