diff --git a/rtgui/batchqueue.cc b/rtgui/batchqueue.cc
index 03cc9535c..3a5576987 100644
--- a/rtgui/batchqueue.cc
+++ b/rtgui/batchqueue.cc
@@ -746,7 +746,7 @@ Glib::ustring BatchQueue::calcAutoFileNameBase (const Glib::ustring& origFileNam
     if (origFileName[0] == '/') {
         pa.push_back ("/" + da[0]);
 	} else if (origFileName[0] == '\\') {
-		if (origFileName[1] == '\\') {
+		if (origFileName.size() > 1 && origFileName[1] == '\\') {
 			pa.push_back ("\\\\" + da[0]);
 		}
 		else {