diff --git a/src/tools/clangrefactoringbackend/source/sourcesmanager.h b/src/tools/clangrefactoringbackend/source/sourcesmanager.h
index 25451b676a4..a586707c638 100644
--- a/src/tools/clangrefactoringbackend/source/sourcesmanager.h
+++ b/src/tools/clangrefactoringbackend/source/sourcesmanager.h
@@ -59,6 +59,8 @@ public:
         if (!upToDate)
            addOrUpdateNewEntry(filePathId, modifiedTime);
 
+        m_dependendFilesModified = m_dependendFilesModified || !upToDate;
+
         return upToDate ;
     }
 
@@ -80,6 +82,17 @@ public:
 
         m_modifiedTimeStamps = std::move(mergedModifiedTimeStamps);
         m_newModifiedTimeStamps.clear();
+        m_dependendFilesModified = false;
+    }
+
+    bool dependendFilesModified() const
+    {
+        return m_dependendFilesModified;
+    }
+
+    bool alreadyParsedAllDependFiles(FilePathId filePathId, std::time_t modifiedTime)
+    {
+        return alreadyParsed(filePathId, modifiedTime) && !dependendFilesModified();
     }
 
 private:
@@ -101,6 +114,7 @@ private:
 private:
     std::vector<FilePathIdTime> m_modifiedTimeStamps;
     std::vector<FilePathIdTime> m_newModifiedTimeStamps;
+    bool m_dependendFilesModified = false;
 };
 
 }
diff --git a/tests/unit/unittest/sourcesmanager-test.cpp b/tests/unit/unittest/sourcesmanager-test.cpp
index f20cb1b143f..f969b9bc09d 100644
--- a/tests/unit/unittest/sourcesmanager-test.cpp
+++ b/tests/unit/unittest/sourcesmanager-test.cpp
@@ -136,4 +136,100 @@ TEST_F(SourcesManager, TimeIsUpdated)
     ASSERT_TRUE(sources.alreadyParsed({1, 1}, 57));
 }
 
+TEST_F(SourcesManager, AnyDependFileIsNotModifiedAfterInitialization)
+{
+    ASSERT_FALSE(sources.dependendFilesModified());
+}
+
+TEST_F(SourcesManager, AnyDependFileIsModified)
+{
+    sources.alreadyParsed({1, 1}, 56);
+
+    ASSERT_TRUE(sources.dependendFilesModified());
+}
+
+TEST_F(SourcesManager, AnyDependFileIsModifiedAfterParsingTwoTimesSameTimeStamp)
+{
+    sources.alreadyParsed({1, 1}, 56);
+    sources.alreadyParsed({1, 1}, 56);
+
+    ASSERT_TRUE(sources.dependendFilesModified());
+}
+
+TEST_F(SourcesManager, AnyDependFileIsNotModifiedAfterUpdate)
+{
+    sources.alreadyParsed({1, 1}, 56);
+    sources.updateModifiedTimeStamps();
+
+    ASSERT_FALSE(sources.dependendFilesModified());
+}
+
+TEST_F(SourcesManager, AnyDependFileIsNotModifiedAfterNotAlreadyPared)
+{
+    sources.alreadyParsed({1, 1}, 56);
+    sources.updateModifiedTimeStamps();
+
+    sources.alreadyParsed({1, 1}, 56);
+
+    ASSERT_FALSE(sources.dependendFilesModified());
+}
+
+TEST_F(SourcesManager, AnyDependFileIsNotModifiedAfterAlreadyPared)
+{
+    sources.alreadyParsed({1, 1}, 56);
+    sources.updateModifiedTimeStamps();
+
+    sources.alreadyParsed({1, 1}, 57);
+
+    ASSERT_TRUE(sources.dependendFilesModified());
+}
+
+TEST_F(SourcesManager, AnyDependFileIsModifiedAfterUpdateNewTimeStamp)
+{
+    sources.alreadyParsed({1, 1}, 56);
+    sources.alreadyParsed({1, 2}, 56);
+    sources.updateModifiedTimeStamps();
+    sources.alreadyParsed({1, 1}, 57);
+
+    sources.alreadyParsed({1, 2}, 56);
+
+    ASSERT_TRUE(sources.dependendFilesModified());
+}
+
+TEST_F(SourcesManager, AlreadyParsedWithDependencyAfterUpdateNewTimeStamp)
+{
+    sources.alreadyParsedAllDependFiles({1, 1}, 56);
+    sources.alreadyParsedAllDependFiles({1, 2}, 56);
+    sources.updateModifiedTimeStamps();
+    sources.alreadyParsedAllDependFiles({1, 1}, 57);
+
+    bool alreadyParsed = sources.alreadyParsedAllDependFiles({1, 2}, 56);
+
+    ASSERT_FALSE(alreadyParsed);
+}
+
+TEST_F(SourcesManager, AlreadyParsedWithDependencyAfterUpdateNewSecondTimeStamp)
+{
+    sources.alreadyParsedAllDependFiles({1, 1}, 56);
+    sources.alreadyParsedAllDependFiles({1, 2}, 56);
+    sources.updateModifiedTimeStamps();
+    sources.alreadyParsedAllDependFiles({1, 1}, 56);
+
+    bool alreadyParsed = sources.alreadyParsedAllDependFiles({1, 2}, 57);
+
+    ASSERT_FALSE(alreadyParsed);
+}
+
+TEST_F(SourcesManager, AlreadyParsedWithDependencyAfterUpdateSameTimeStamps)
+{
+    sources.alreadyParsedAllDependFiles({1, 1}, 56);
+    sources.alreadyParsedAllDependFiles({1, 2}, 56);
+    sources.updateModifiedTimeStamps();
+    sources.alreadyParsedAllDependFiles({1, 1}, 56);
+
+    bool alreadyParsed = sources.alreadyParsedAllDependFiles({1, 2}, 56);
+
+    ASSERT_TRUE(alreadyParsed);
+}
+
 }