diff --git a/src/Buffer.cpp b/src/Buffer.cpp
index 37be152281..7d25df1e38 100644
--- a/src/Buffer.cpp
+++ b/src/Buffer.cpp
@@ -2437,6 +2437,8 @@ bool Buffer::isExternallyModified(CheckMethod method) const
 void Buffer::saveCheckSum() const
 {
 	FileName const & file = d->filename;
+
+	file.refresh();
 	if (file.exists()) {
 		d->timestamp_ = file.lastModified();
 		d->checksum_ = file.checksum();