diff --git a/src/LyXVC.cpp b/src/LyXVC.cpp
index 808ae2b50f..8c98d5ec53 100644
--- a/src/LyXVC.cpp
+++ b/src/LyXVC.cpp
@@ -159,6 +159,9 @@ void LyXVC::checkIn()
 
 void LyXVC::checkOut()
 {
+	//RCS allows checkOut only in ReadOnly mode
+	if (vcs->toggleReadOnlyEnabled() && !owner_->isReadonly()) return;
+
 	LYXERR(Debug::LYXVC, "LyXVC: checkOut");
 	vcs->checkOut();
 }