diff --git a/src/ls_mysql.c b/src/ls_mysql.c
index 0694353..c7ff7df 100644
--- a/src/ls_mysql.c
+++ b/src/ls_mysql.c
@@ -2,7 +2,7 @@
 ** LuaSQL, MySQL driver
 ** Authors:  Eduardo Quintao
 ** See Copyright Notice in license.html
-** $Id: ls_mysql.c,v 1.22 2006/08/22 14:42:59 tomas Exp $
+** $Id: ls_mysql.c,v 1.23 2007/03/09 14:56:20 tomas Exp $
 */
 
 #include <assert.h>
@@ -426,7 +426,8 @@ static int conn_setautocommit (lua_State *L) {
 	else {
 		mysql_autocommit(conn->my_conn, 0);
 	}
-	return 0;
+	lua_pushboolean(L, 1);
+	return 1;
 }
 
 
diff --git a/src/ls_oci8.c b/src/ls_oci8.c
index 43a4df6..dd756c2 100644
--- a/src/ls_oci8.c
+++ b/src/ls_oci8.c
@@ -2,7 +2,7 @@
 ** LuaSQL, Oracle driver
 ** Authors: Tomas Guisasola, Leonardo Godinho
 ** See Copyright Notice in license.html
-** $Id: ls_oci8.c,v 1.26 2006/08/22 14:42:59 tomas Exp $
+** $Id: ls_oci8.c,v 1.27 2007/03/09 14:56:20 tomas Exp $
 */
 
 #include <assert.h>
@@ -704,7 +704,8 @@ static int conn_setautocommit (lua_State *L) {
 		conn->auto_commit = 0;
 		/* sql_begin(conn);*/
 	}
-	return 0;
+	lua_pushboolean(L, 1);
+	return 1;
 }
 
 
diff --git a/src/ls_postgres.c b/src/ls_postgres.c
index 2704c92..7294a84 100644
--- a/src/ls_postgres.c
+++ b/src/ls_postgres.c
@@ -3,7 +3,7 @@
 ** Authors: Pedro Rabinovitch, Roberto Ierusalimschy, Carlos Cassino
 ** Tomas Guisasola, Eduardo Quintao
 ** See Copyright Notice in license.html
-** $Id: ls_postgres.c,v 1.5 2006/09/18 14:04:56 tomas Exp $
+** $Id: ls_postgres.c,v 1.6 2007/03/09 14:56:20 tomas Exp $
 */
 
 #include <assert.h>
@@ -397,7 +397,8 @@ static int conn_setautocommit (lua_State *L) {
 		conn->auto_commit = 0;
 		sql_begin(conn);
 	}
-	return 0;
+	lua_pushboolean(L, 1);
+	return 1;
 }
 
 
diff --git a/src/ls_sqlite.c b/src/ls_sqlite.c
index 95b1000..aabbd9a 100644
--- a/src/ls_sqlite.c
+++ b/src/ls_sqlite.c
@@ -2,7 +2,7 @@
 ** LuaSQL, SQLite driver
 ** Author: Tiago Dionizio, Eduardo Quintao
 ** See Copyright Notice in license.html
-** $Id: ls_sqlite.c,v 1.9 2006/08/22 14:42:59 tomas Exp $
+** $Id: ls_sqlite.c,v 1.10 2007/03/09 14:56:20 tomas Exp $
 */
 
 #include <stdio.h>
@@ -429,7 +429,8 @@ static int conn_setautocommit(lua_State *L)
             lua_error(L);
         }
 	}
-	return 0;
+	lua_pushboolean(L, 1);
+	return 1;
 }
 
 
diff --git a/tests/test.lua b/tests/test.lua
index 90defd7..4d34d67 100644
--- a/tests/test.lua
+++ b/tests/test.lua
@@ -359,7 +359,8 @@ end
 ---------------------------------------------------------------------
 ---------------------------------------------------------------------
 function rollback ()
-	CONN:setautocommit (false) -- == begin transaction
+	-- begin transaction
+	assert2 (true, CONN:setautocommit (false), "couldn't disable autocommit")
 	-- insert a record and commit the operation.
 	assert2 (1, CONN:execute ("insert into t (f1) values ('a')"))
 	local cur = CUR_OK (CONN:execute ("select count(*) from t"))
@@ -400,7 +401,7 @@ function rollback ()
 	assert2 (2, tonumber (cur:fetch ()), "Insert failed")
 	assert2 (true, cur:close(), "couldn't close cursor")
 	assert2 (false, cur:close())
-	CONN:setautocommit (true)
+	assert2 (true, CONN:setautocommit (true), "couldn't enable autocommit")
 	-- check resulting table with one record.
 	cur = CUR_OK (CONN:execute ("select count(*) from t"))
 	assert2 (1, tonumber(cur:fetch()), "Rollback failed")
@@ -410,7 +411,7 @@ function rollback ()
 	-- clean the table.
 	assert2 (1, CONN:execute (sql_erase_table"t"))
 	CONN:commit ()
-	CONN:setautocommit (true)
+	assert2 (true, CONN:setautocommit (true), "couldn't enable autocommit")
 	-- check resulting table with no records.
 	cur = CUR_OK (CONN:execute ("select count(*) from t"))
 	assert2 (0, tonumber(cur:fetch()), "Rollback failed")
@@ -486,8 +487,8 @@ end
 ---------------------------------------------------------------------
 ---------------------------------------------------------------------
 function drop_table ()
+	assert2 (true, CONN:setautocommit(true), "couldn't enable autocommit")
 	-- Postgres retorna 0, enquanto ODBC retorna -1.
-	CONN:setautocommit(true)
 	assert2 (DROP_TABLE_RETURN_VALUE, CONN:execute ("drop table t"))
 end