diff --git a/mysql-test/r/union.result b/mysql-test/r/union.result
index bed4e890c18..afee837b1a5 100644
--- a/mysql-test/r/union.result
+++ b/mysql-test/r/union.result
@@ -960,3 +960,31 @@ a
 a
 150
 drop table t1;
+CREATE TABLE t1 ( ID1 int(10) unsigned NOT NULL DEFAULT '0' , ID2 datetime NOT NULL DEFAULT '0000-00-00 00:00:00' , DATA1 varchar(10) , DATA2 double(5,4) , DATA3 datetime , PRIMARY KEY (ID1,ID2));
+CREATE TABLE t2 ( ID int(3) unsigned NOT NULL DEFAULT '0' , DATA1 timestamp DEFAULT '0000-00-00 00:00:00' , PRIMARY KEY (ID));
+(SELECT * FROM t1 AS PARTITIONED, t2 AS
+PARTITIONED_B WHERE PARTITIONED_B.ID=PARTITIONED.ID1) UNION
+(SELECT * FROM t1 AS PARTITIONED, t2 AS
+PARTITIONED_B WHERE PARTITIONED_B.ID=PARTITIONED.ID1) UNION
+(SELECT * FROM t1 AS PARTITIONED, t2 AS
+PARTITIONED_B WHERE PARTITIONED_B.ID=PARTITIONED.ID1) UNION
+(SELECT * FROM t1 AS PARTITIONED, t2 AS
+PARTITIONED_B WHERE PARTITIONED_B.ID=PARTITIONED.ID1) UNION
+(SELECT * FROM t1 AS PARTITIONED, t2 AS
+PARTITIONED_B WHERE PARTITIONED_B.ID=PARTITIONED.ID1) UNION
+(SELECT * FROM t1 AS PARTITIONED, t2 AS
+PARTITIONED_B WHERE PARTITIONED_B.ID=PARTITIONED.ID1) UNION
+(SELECT * FROM t1 AS PARTITIONED, t2 AS
+PARTITIONED_B WHERE PARTITIONED_B.ID=PARTITIONED.ID1) UNION
+(SELECT * FROM t1 AS PARTITIONED, t2 AS
+PARTITIONED_B WHERE PARTITIONED_B.ID=PARTITIONED.ID1) UNION
+(SELECT * FROM t1 AS PARTITIONED, t2 AS
+PARTITIONED_B WHERE PARTITIONED_B.ID=PARTITIONED.ID1) UNION
+(SELECT * FROM t1 AS PARTITIONED, t2 AS
+PARTITIONED_B WHERE PARTITIONED_B.ID=PARTITIONED.ID1) UNION
+(SELECT * FROM t1 AS PARTITIONED, t2 AS
+PARTITIONED_B WHERE PARTITIONED_B.ID=PARTITIONED.ID1) UNION
+(SELECT * FROM t1 AS PARTITIONED, t2 AS
+PARTITIONED_B WHERE PARTITIONED_B.ID=PARTITIONED.ID1);
+ID1	ID2	DATA1	DATA2	DATA3	ID	DATA1
+drop table t1,t2;
diff --git a/mysql-test/t/union.test b/mysql-test/t/union.test
index b21f635162f..206b40f8ce7 100644
--- a/mysql-test/t/union.test
+++ b/mysql-test/t/union.test
@@ -535,3 +535,35 @@ CREATE TABLE t1 (uid int(1));
 INSERT INTO t1 SELECT 150;
 SELECT 'a' UNION SELECT uid FROM t1;
 drop table t1;
+
+#
+# parser stack overflow
+#
+CREATE TABLE t1 ( ID1 int(10) unsigned NOT NULL DEFAULT '0' , ID2 datetime NOT NULL DEFAULT '0000-00-00 00:00:00' , DATA1 varchar(10) , DATA2 double(5,4) , DATA3 datetime , PRIMARY KEY (ID1,ID2));
+
+CREATE TABLE t2 ( ID int(3) unsigned NOT NULL DEFAULT '0' , DATA1 timestamp DEFAULT '0000-00-00 00:00:00' , PRIMARY KEY (ID));
+(SELECT * FROM t1 AS PARTITIONED, t2 AS
+PARTITIONED_B WHERE PARTITIONED_B.ID=PARTITIONED.ID1) UNION
+(SELECT * FROM t1 AS PARTITIONED, t2 AS
+PARTITIONED_B WHERE PARTITIONED_B.ID=PARTITIONED.ID1) UNION
+(SELECT * FROM t1 AS PARTITIONED, t2 AS
+PARTITIONED_B WHERE PARTITIONED_B.ID=PARTITIONED.ID1) UNION
+(SELECT * FROM t1 AS PARTITIONED, t2 AS
+PARTITIONED_B WHERE PARTITIONED_B.ID=PARTITIONED.ID1) UNION
+(SELECT * FROM t1 AS PARTITIONED, t2 AS
+PARTITIONED_B WHERE PARTITIONED_B.ID=PARTITIONED.ID1) UNION
+(SELECT * FROM t1 AS PARTITIONED, t2 AS
+PARTITIONED_B WHERE PARTITIONED_B.ID=PARTITIONED.ID1) UNION
+(SELECT * FROM t1 AS PARTITIONED, t2 AS
+PARTITIONED_B WHERE PARTITIONED_B.ID=PARTITIONED.ID1) UNION
+(SELECT * FROM t1 AS PARTITIONED, t2 AS
+PARTITIONED_B WHERE PARTITIONED_B.ID=PARTITIONED.ID1) UNION
+(SELECT * FROM t1 AS PARTITIONED, t2 AS
+PARTITIONED_B WHERE PARTITIONED_B.ID=PARTITIONED.ID1) UNION
+(SELECT * FROM t1 AS PARTITIONED, t2 AS
+PARTITIONED_B WHERE PARTITIONED_B.ID=PARTITIONED.ID1) UNION
+(SELECT * FROM t1 AS PARTITIONED, t2 AS
+PARTITIONED_B WHERE PARTITIONED_B.ID=PARTITIONED.ID1) UNION
+(SELECT * FROM t1 AS PARTITIONED, t2 AS
+PARTITIONED_B WHERE PARTITIONED_B.ID=PARTITIONED.ID1);
+drop table t1,t2;
diff --git a/sql/sql_parse.cc b/sql/sql_parse.cc
index 2d8facfa63f..eda3b61b2d1 100644
--- a/sql/sql_parse.cc
+++ b/sql/sql_parse.cc
@@ -3816,10 +3816,10 @@ bool check_stack_overrun(THD *thd,char *buf __attribute__((unused)))
 #define MY_YACC_INIT 1000			// Start with big alloc
 #define MY_YACC_MAX  32000			// Because of 'short'
 
-bool my_yyoverflow(short **yyss, YYSTYPE **yyvs, int *yystacksize)
+bool my_yyoverflow(short **yyss, YYSTYPE **yyvs, ulong *yystacksize)
 {
   LEX	*lex=current_lex;
-  int  old_info=0;
+  ulong old_info=0;
   if ((uint) *yystacksize >= MY_YACC_MAX)
     return 1;
   if (!lex->yacc_yyvs)
diff --git a/sql/sql_yacc.yy b/sql/sql_yacc.yy
index 1e194d953c1..6e88247bf32 100644
--- a/sql/sql_yacc.yy
+++ b/sql/sql_yacc.yy
@@ -40,7 +40,7 @@
 
 int yylex(void *yylval, void *yythd);
 
-#define yyoverflow(A,B,C,D,E,F) if (my_yyoverflow((B),(D),(int*) (F))) { yyerror((char*) (A)); return 2; }
+#define yyoverflow(A,B,C,D,E,F) {ulong val= *(F); if(my_yyoverflow((B), (D), &val)) { yyerror((char*) (A)); return 2; } else { *(F)= (YYSIZE_T)val; }}
 
 #define WARN_DEPRECATED(A,B) \
   push_warning_printf(((THD *)yythd), MYSQL_ERROR::WARN_LEVEL_WARN, \
@@ -90,7 +90,7 @@ inline Item *or_or_concat(THD *thd, Item* A, Item* B)
 }
 
 %{
-bool my_yyoverflow(short **a, YYSTYPE **b,int *yystacksize);
+bool my_yyoverflow(short **a, YYSTYPE **b, ulong *yystacksize);
 %}
 
 %pure_parser					/* We have threads */