diff --git a/rtgui/paramsedited.cc b/rtgui/paramsedited.cc
index 7c32265d9..aa3c21256 100644
--- a/rtgui/paramsedited.cc
+++ b/rtgui/paramsedited.cc
@@ -3053,7 +3053,7 @@ bool RAWParamsEdited::isUnchanged() const
 
 bool LensProfParamsEdited::isUnchanged() const
 {
-    return lcpFile;
+    return lcpFile && useVign && lfLens;
 }
 
 bool RetinexParamsEdited::isUnchanged() const