diff --git a/src/libs/cplusplus/BackwardsScanner.cpp b/src/libs/cplusplus/BackwardsScanner.cpp
index 0bb4857ee8a..cb70571a52b 100644
--- a/src/libs/cplusplus/BackwardsScanner.cpp
+++ b/src/libs/cplusplus/BackwardsScanner.cpp
@@ -46,7 +46,7 @@ BackwardsScanner::BackwardsScanner(const QTextCursor &cursor,
 {
     _tokenize.setLanguageFeatures(languageFeatures);
     _tokenize.setSkipComments(skipComments);
-    _text = _block.text().left(cursor.position() - cursor.block().position());
+    _text = _block.text().left(cursor.positionInBlock());
 
     if (! suffix.isEmpty())
         _text += suffix;