diff --git a/mysql-test/r/windows.result b/mysql-test/r/windows.result
index 5a54db8bb84..43ba878b9a5 100644
--- a/mysql-test/r/windows.result
+++ b/mysql-test/r/windows.result
@@ -19,4 +19,22 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
 2	SUBQUERY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
 DROP TABLE t1;
+CREATE DATABASE `TESTDB`;
+USE `TESTDB`;
+CREATE FUNCTION test_fn() RETURNS INTEGER
+BEGIN
+DECLARE rId bigint;
+RETURN rId;
+END
+//
+CREATE FUNCTION test_fn2() RETURNS INTEGER
+BEGIN
+DECLARE rId bigint;
+RETURN rId;
+END
+//
+DROP FUNCTION `TESTDB`.`test_fn`;
+DROP FUNCTION `testdb`.`test_fn2`;
+USE test;
+DROP DATABASE `TESTDB`;
 End of 5.0 tests.
diff --git a/mysql-test/t/windows.test b/mysql-test/t/windows.test
index 6e6a7ec93a3..adaf8d3ea17 100755
--- a/mysql-test/t/windows.test
+++ b/mysql-test/t/windows.test
@@ -35,4 +35,35 @@ CREATE TABLE t1 (a int, b int); INSERT INTO t1 VALUES (1,1);
 EXPLAIN SELECT * FROM t1 WHERE b =  (SELECT max(2));
 DROP TABLE t1;
 
+#
+# Bug #33813: Schema names are case-sensitive in DROP FUNCTION
+#
+
+CREATE DATABASE `TESTDB`;
+
+USE `TESTDB`;
+DELIMITER //;
+
+CREATE FUNCTION test_fn() RETURNS INTEGER
+BEGIN
+DECLARE rId bigint;
+RETURN rId;
+END
+//
+
+CREATE FUNCTION test_fn2() RETURNS INTEGER
+BEGIN
+DECLARE rId bigint;
+RETURN rId;
+END
+//
+
+DELIMITER ;//
+
+DROP FUNCTION `TESTDB`.`test_fn`;
+DROP FUNCTION `testdb`.`test_fn2`;
+
+USE test;
+DROP DATABASE `TESTDB`;
+
 --echo End of 5.0 tests.
diff --git a/sql/sql_yacc.yy b/sql/sql_yacc.yy
index 0eefe782354..fbaf761cc33 100644
--- a/sql/sql_yacc.yy
+++ b/sql/sql_yacc.yy
@@ -7507,11 +7507,9 @@ drop:
 	    lex->drop_if_exists=$3;
 	    lex->name=$4.str;
 	 }
-	| DROP FUNCTION_SYM if_exists ident '.' ident
+	| DROP FUNCTION_SYM if_exists sp_name
 	  {
-            THD *thd= YYTHD;
-            LEX *lex= thd->lex;
-            sp_name *spname;
+            LEX *lex= Lex;
 	    if (lex->sphead)
 	    {
 	      my_error(ER_SP_NO_DROP_SP, MYF(0), "FUNCTION");
@@ -7519,32 +7517,7 @@ drop:
 	    }
 	    lex->sql_command = SQLCOM_DROP_FUNCTION;
 	    lex->drop_if_exists= $3;
-	    spname= new sp_name($4, $6, true);
-            if (spname == NULL)
-              MYSQL_YYABORT;
-	    spname->init_qname(thd);
-	    lex->spname= spname;
-	  }
-	| DROP FUNCTION_SYM if_exists ident
-	  {
-            THD *thd= YYTHD;
-            LEX *lex= thd->lex;
-            LEX_STRING db= {0, 0};
-            sp_name *spname;
-	    if (lex->sphead)
-	    {
-	      my_error(ER_SP_NO_DROP_SP, MYF(0), "FUNCTION");
-	      MYSQL_YYABORT;
-	    }
-            if (thd->db && lex->copy_db_to(&db.str, &db.length))
-              MYSQL_YYABORT;
-	    lex->sql_command = SQLCOM_DROP_FUNCTION;
-	    lex->drop_if_exists= $3;
-	    spname= new sp_name(db, $4, false);
-            if (spname == NULL)
-              MYSQL_YYABORT;
-	    spname->init_qname(thd);
-	    lex->spname= spname;
+	    lex->spname= $4;
 	  }
 	| DROP PROCEDURE if_exists sp_name
 	  {