diff --git a/src/plugins/clangcodemodel/clangcompletionassistprocessor.cpp b/src/plugins/clangcodemodel/clangcompletionassistprocessor.cpp
index 467aca1bf5f..06bcbebd899 100644
--- a/src/plugins/clangcodemodel/clangcompletionassistprocessor.cpp
+++ b/src/plugins/clangcodemodel/clangcompletionassistprocessor.cpp
@@ -559,8 +559,7 @@ ClangCompletionAssistProcessor::extractLineColumn(int position)
     int line = -1, column = -1;
     ::Utils::Text::convertPosition(m_interface->textDocument(), position, &line, &column);
 
-    const QTextBlock block = m_interface->textDocument()->findBlock(position);
-    column = Utils::clangColumn(block.text(), column);
+    column = Utils::clangColumn(m_interface->textDocument()->findBlock(position), column);
     return {line, column};
 }
 
diff --git a/src/plugins/clangcodemodel/clangeditordocumentprocessor.cpp b/src/plugins/clangcodemodel/clangeditordocumentprocessor.cpp
index 4cc107b0b42..9771c1115b9 100644
--- a/src/plugins/clangcodemodel/clangeditordocumentprocessor.cpp
+++ b/src/plugins/clangcodemodel/clangeditordocumentprocessor.cpp
@@ -347,8 +347,7 @@ ClangEditorDocumentProcessor::cursorInfo(const CppTools::CursorInfoParams &param
     if (!isCursorOnIdentifier(params.textCursor))
         return defaultCursorInfoFuture();
 
-    const QTextBlock block = params.textCursor.document()->findBlockByNumber(line - 1);
-    column = Utils::clangColumn(block.text(), column);
+    column = Utils::clangColumn(params.textCursor.document()->findBlockByNumber(line - 1), column);
     const CppTools::SemanticInfo::LocalUseMap localUses
         = CppTools::BuiltinCursorInfo::findLocalUses(params.semanticInfo.doc, line, column);
 
diff --git a/src/plugins/clangcodemodel/clangutils.cpp b/src/plugins/clangcodemodel/clangutils.cpp
index 30dbbe7b104..cebf0b8b4c6 100644
--- a/src/plugins/clangcodemodel/clangutils.cpp
+++ b/src/plugins/clangcodemodel/clangutils.cpp
@@ -43,6 +43,7 @@
 #include <QDir>
 #include <QFile>
 #include <QStringList>
+#include <QTextBlock>
 
 using namespace ClangCodeModel;
 using namespace ClangCodeModel::Internal;
@@ -190,14 +191,14 @@ void setLastSentDocumentRevision(const QString &filePath, uint revision)
         document->sendTracker().setLastSentRevision(int(revision));
 }
 
-int clangColumn(const QString &lineText, int cppEditorColumn)
+int clangColumn(const QTextBlock &line, int cppEditorColumn)
 {
     // (1) cppEditorColumn is the actual column shown by CppEditor.
     // (2) The return value is the column in Clang which is the utf8 byte offset from the beginning
     //     of the line.
     // Here we convert column from (1) to (2).
     // '+ 1' is for 1-based columns
-    return lineText.left(cppEditorColumn).toUtf8().size() + 1;
+    return line.text().left(cppEditorColumn).toUtf8().size() + 1;
 }
 
 } // namespace Utils
diff --git a/src/plugins/clangcodemodel/clangutils.h b/src/plugins/clangcodemodel/clangutils.h
index c1bf34ddf10..a67d40b18ac 100644
--- a/src/plugins/clangcodemodel/clangutils.h
+++ b/src/plugins/clangcodemodel/clangutils.h
@@ -27,6 +27,10 @@
 
 #include <cpptools/projectpart.h>
 
+QT_BEGIN_NAMESPACE
+class QTextBlock;
+QT_END_NAMESPACE
+
 namespace CppTools {
 class CppEditorDocumentHandle;
 }
@@ -46,7 +50,7 @@ CppTools::ProjectPart::Ptr projectPartForFile(const QString &filePath);
 CppTools::ProjectPart::Ptr projectPartForFileBasedOnProcessor(const QString &filePath);
 bool isProjectPartLoaded(const CppTools::ProjectPart::Ptr projectPart);
 QString projectPartIdForFile(const QString &filePath);
-int clangColumn(const QString &lineText, int cppEditorColumn);
+int clangColumn(const QTextBlock &lineText, int cppEditorColumn);
 
 } // namespace Utils
 } // namespace Clang