diff --git a/openlp/core/utils/__init__.py b/openlp/core/utils/__init__.py
index 6a6376fa6..1fc75b6d8 100644
--- a/openlp/core/utils/__init__.py
+++ b/openlp/core/utils/__init__.py
@@ -53,8 +53,8 @@ APPLICATION_VERSION = {}
 IMAGES_FILTER = None
 UNO_CONNECTION_TYPE = u'pipe'
 #UNO_CONNECTION_TYPE = u'socket'
-CONTROL_CHARS = re.compile(u'[\x00-\x1F\x7F-\x9F]', re.UNICODE)
-INVALID_FILE_CHARS = re.compile(r'[\/:*?"<>|+[]%]', re.UNICODE)
+CONTROL_CHARS = re.compile(r'[\x00-\x1F\x7F-\x9F]', re.UNICODE)
+INVALID_FILE_CHARS = re.compile(r'[\\/:\*\?"<>\|\+\[\]%]', re.UNICODE)
 VERSION_SPLITTER = re.compile(r'([0-9]+).([0-9]+).([0-9]+)(?:-bzr([0-9]+))?')
 
 class VersionThread(QtCore.QThread):