diff --git a/src/lib_python/project/SourceGroupPythonEmpty.cpp b/src/lib_python/project/SourceGroupPythonEmpty.cpp
index 79b5a4a7..5f5661f3 100644
--- a/src/lib_python/project/SourceGroupPythonEmpty.cpp
+++ b/src/lib_python/project/SourceGroupPythonEmpty.cpp
@@ -13,6 +13,11 @@ SourceGroupPythonEmpty::SourceGroupPythonEmpty(std::shared_ptr<SourceGroupSettin
 {
 }
 
+bool SourceGroupPythonEmpty::allowsPartialClearing() const
+{
+	return false;
+}
+
 std::set<FilePath> SourceGroupPythonEmpty::filterToContainedFilePaths(const std::set<FilePath>& filePaths) const
 {
 	return SourceGroup::filterToContainedFilePaths(
diff --git a/src/lib_python/project/SourceGroupPythonEmpty.h b/src/lib_python/project/SourceGroupPythonEmpty.h
index 2bbc0024..a14fe8ea 100644
--- a/src/lib_python/project/SourceGroupPythonEmpty.h
+++ b/src/lib_python/project/SourceGroupPythonEmpty.h
@@ -13,6 +13,7 @@ class SourceGroupPythonEmpty: public SourceGroup
 public:
 	SourceGroupPythonEmpty(std::shared_ptr<SourceGroupSettingsPythonEmpty> settings);
 
+	bool allowsPartialClearing() const override;
 	std::set<FilePath> filterToContainedFilePaths(const std::set<FilePath>& filePaths) const override;
 	std::set<FilePath> getAllSourceFilePaths() const override;
 	std::vector<std::shared_ptr<IndexerCommand>> getIndexerCommands(const std::set<FilePath>& filesToIndex) const override;