diff --git a/dotdrop/cfg_aggregator.py b/dotdrop/cfg_aggregator.py
index dc0d5bc..eb8462c 100644
--- a/dotdrop/cfg_aggregator.py
+++ b/dotdrop/cfg_aggregator.py
@@ -25,7 +25,7 @@ from dotdrop.exceptions import UndefinedException, YamlException, \
 
 
 TILD = '~'
-YAML_OK = r'[^0-9a-zA-Z.\-_]+'
+YAML_OK = r'[^0-9a-zA-Z.\-_+]+'
 YAML_REPL = '_'