diff --git a/src/plugins/clangcodemodel/semanticmarker.cpp b/src/plugins/clangcodemodel/semanticmarker.cpp
index 7e5661d31cb..0d7c6946fd2 100644
--- a/src/plugins/clangcodemodel/semanticmarker.cpp
+++ b/src/plugins/clangcodemodel/semanticmarker.cpp
@@ -83,6 +83,7 @@ void SemanticMarker::setCompilationOptions(const QStringList &options)
         return;
 
     m_unit->setCompilationOptions(options);
+    m_unit->unload();
 }
 
 void SemanticMarker::reparse(const UnsavedFiles &unsavedFiles)