diff --git a/GUI/host/textthread.cpp b/GUI/host/textthread.cpp
index f7f9d75..5a5e554 100644
--- a/GUI/host/textthread.cpp
+++ b/GUI/host/textthread.cpp
@@ -38,15 +38,6 @@ void TextThread::Push(const BYTE* data, int len)
 	lastPushTime = GetTickCount();
 }
 
-bool TextThread::FilterRepetition(std::wstring& sentence)
-{
-	wchar_t* end = sentence.data() + sentence.size();
-	for (int len = sentence.size() / 3; len > 6; --len)
-		if (wcsncmp(end - len * 3, end - len * 2, len) == 0 && wcsncmp(end - len * 3, end - len * 1, len) == 0)
-			return true | FilterRepetition(sentence = end - len);
-	return false;
-}
-
 void TextThread::Flush()
 {
 	std::wstring sentence;
@@ -57,7 +48,7 @@ void TextThread::Flush()
 		sentence = buffer;
 		buffer.clear();
 
-		if (FilterRepetition(sentence)) repeatingChars = std::unordered_set(sentence.begin(), sentence.end());
+		if (Util::RemoveRepetition(sentence)) repeatingChars = std::unordered_set(sentence.begin(), sentence.end());
 		else repeatingChars.clear();
 	}
 	AddSentence(sentence);
diff --git a/GUI/host/textthread.h b/GUI/host/textthread.h
index f6af2f4..d793e89 100644
--- a/GUI/host/textthread.h
+++ b/GUI/host/textthread.h
@@ -30,15 +30,13 @@ public:
 	const HookParam hp;
 
 private:
-	// see https://github.com/Artikash/Textractor/issues/40
-	static bool FilterRepetition(std::wstring& sentence);
 	void Flush();
 
 	std::wstring buffer;
 	std::unordered_set<wchar_t> repeatingChars;
 	std::mutex bufferMutex;
 	std::wstring storage;
-	std::recursive_mutex storageMutex;
+	std::mutex storageMutex;
 
 	HANDLE deletionEvent = CreateEventW(nullptr, FALSE, FALSE, NULL);
 	std::thread flushThread = std::thread([&] { while (WaitForSingleObject(deletionEvent, 10) == WAIT_TIMEOUT) Flush(); });
diff --git a/GUI/host/util.cpp b/GUI/host/util.cpp
index 23ecda6..6816f8a 100644
--- a/GUI/host/util.cpp
+++ b/GUI/host/util.cpp
@@ -34,4 +34,13 @@ namespace Util
 			return L"";
 		}
 	}
+
+	bool RemoveRepetition(std::wstring& text)
+	{
+		wchar_t* end = text.data() + text.size();
+		for (int len = text.size() / 3; len > 6; --len)
+			if (wcsncmp(end - len * 3, end - len * 2, len) == 0 && wcsncmp(end - len * 3, end - len * 1, len) == 0)
+				return true | RemoveRepetition(text = end - len);
+		return false;
+	}
 }
\ No newline at end of file
diff --git a/GUI/host/util.h b/GUI/host/util.h
index 43bb841..1a3ebad 100644
--- a/GUI/host/util.h
+++ b/GUI/host/util.h
@@ -6,4 +6,6 @@ namespace Util
 {
 	std::optional<std::wstring> GetClipboardText();
 	std::wstring StringToWideString(std::string text, UINT encoding = CP_UTF8);
+	// return true if repetition found (see https://github.com/Artikash/Textractor/issues/40)
+	bool RemoveRepetition(std::wstring& text); 
 }