diff --git a/PowerEditor/src/Notepad_plus.cpp b/PowerEditor/src/Notepad_plus.cpp
index f8ee0796e..2469882d3 100644
--- a/PowerEditor/src/Notepad_plus.cpp
+++ b/PowerEditor/src/Notepad_plus.cpp
@@ -1414,7 +1414,7 @@ void Notepad_plus::removeDuplicateLines()
 	_findReplaceDlg.processAll(ProcessReplaceAll, &env, true);
 
 	// remove the last line if it's a duplicate line.
-	env._str2Search = TEXT("^(.+)\\r?\\n(\\1)");
+	env._str2Search = TEXT("^(.+)\\r?\\n(\\1)$");
 	env._str4Replace = TEXT("\\1");
     env._searchType = FindRegex;
 	_findReplaceDlg.processAll(ProcessReplaceAll, &env, true);