--- mysql-5.1/sql/sql_yacc.yy	2007-05-08 12:25:51.000000000 +0200
+++ mysql-5.1-truncate/sql/sql_yacc.yy	2007-05-08 15:55:42.000000000 +0200
@@ -6741,6 +6741,13 @@
 	  { $$= new (YYTHD->mem_root) Item_func_replace($3,$5,$7); }
 	| TRUNCATE_SYM '(' expr ',' expr ')'
 	  { $$= new (YYTHD->mem_root) Item_func_round($3,$5,1); }
+	| TRUNCATE_SYM '(' expr ')'
+	  { 
+            THD *thd= YYTHD;
+            Item *i1= new (thd->mem_root) Item_int((char*) "0",(int32) 0,1);
+      	    
+      	    $$= new (thd->mem_root) Item_func_round($3,i1,1); 
+	  }
 	| WEEK_SYM '(' expr ')'
 	  {
             THD *thd= YYTHD;