diff --git a/PowerEditor/src/Notepad_plus.cpp b/PowerEditor/src/Notepad_plus.cpp
index 89329fd75..31a0081a8 100644
--- a/PowerEditor/src/Notepad_plus.cpp
+++ b/PowerEditor/src/Notepad_plus.cpp
@@ -3640,7 +3640,7 @@ void Notepad_plus::maintainIndentation(TCHAR ch)
 			auto startPos = _pEditView->execute(SCI_POSITIONFROMLINE, curLine);
 			LRESULT endPos = _pEditView->execute(SCI_GETCURRENTPOS);
 
-			for (LRESULT i = endPos - 2; i > 0 && i > startPos; --i)
+			for (LRESULT i = endPos - 2; i > 0 && i >= startPos; --i)
 			{
 				UCHAR aChar = (UCHAR)_pEditView->execute(SCI_GETCHARAT, i);
 				if (aChar != ' ' && aChar != '\t')