diff --git a/dibi/dibi.php b/dibi/dibi.php
index 609fb650..44d45ccb 100644
--- a/dibi/dibi.php
+++ b/dibi/dibi.php
@@ -653,7 +653,7 @@ class dibi
 		if ($expr === TRUE) {
 			self::$substs = array();
 		} else {
-			unset(self::$substs[':'.$expr.':']);
+			unset(self::$substs[$expr]);
 		}
 	}
 
diff --git a/examples/using-substitutions.php b/examples/using-substitutions.php
index a87c94ae..96bc83e9 100644
--- a/examples/using-substitutions.php
+++ b/examples/using-substitutions.php
@@ -55,8 +55,8 @@ define('SUBST_ACCOUNT', 'eshop_');
 define('SUBST_ACTIVE', 7);
 
 dibi::test("
-	UPDATE [:account:user]
-	SET [name]='John Doe', [status]=:active:
+	UPDATE :account:user
+	SET name='John Doe', status=:active:
 	WHERE id=", 7
 );
-// -> UPDATE [the_accountuser] SET [name]='John Doe', [status]=7 WHERE id=7
+// -> UPDATE eshop_user SET name='John Doe', status=7 WHERE id= 7