diff --git a/src/dedup.cpp b/src/dedup.cpp
index 1abad9c..653051c 100644
--- a/src/dedup.cpp
+++ b/src/dedup.cpp
@@ -50,7 +50,7 @@ void Dedup::start() {
 	removeUninterestingFiles(foundfiles);
 
 	// hashing
-	uint64_t bytesToHash = std::accumulate(foundfiles.begin(), foundfiles.end(), 0ul, [](uint64_t& c, const std::pair<uint64_t, std::shared_ptr<File>>& it) { return c + it.second->filesize; });
+	uint64_t bytesToHash = std::accumulate(foundfiles.begin(), foundfiles.end(), 0ul, [](uint64_t& c, auto it) { return c + it.second->filesize; });
 
 	Log::info << foundfiles.size() << " files and " << FileSize(bytesToHash) << " are going to be hashed";
 
@@ -92,34 +92,38 @@ std::map<uint64_t, Files> Dedup::hash(std::multimap<uint64_t, std::shared_ptr<Fi
 	std::mutex globalData;
 
 	std::vector<HasherThread*> threads;
-	std::vector<std::multimap<uint64_t, std::shared_ptr<File>>::iterator> threadit;
+	std::vector<std::multimap<uint64_t, std::shared_ptr<File>>::iterator> threadends;
+	std::vector<std::multimap<uint64_t, std::shared_ptr<File>>::iterator> threadits;
 	threads.reserve(HASHTHREADCOUNT);
-	threadit.reserve(HASHTHREADCOUNT + 1);
+	threadends.resize(HASHTHREADCOUNT);
+	threadits.resize(HASHTHREADCOUNT);
 
 	// create threads
 	Log::info << "spawning " << (int) HASHTHREADCOUNT << " hashing threads";
 
-	threadit.push_back(foundfiles.begin());
-	for(uint_fast8_t i = 0; i < HASHTHREADCOUNT; ++i) {
+	threadits.at(0) = foundfiles.begin();
+	for(uint_fast8_t i = 1; i < HASHTHREADCOUNT; ++i) {
 		// make a copy!
-		std::multimap<uint64_t, std::shared_ptr<File>>::iterator it = threadit.at(i);
+		std::multimap<uint64_t, std::shared_ptr<File>>::iterator it = threadits.at(i-1);
 		std::advance(it, stepsize);
-		threadit.push_back(it);
+
+		threadits.at(i) = it;
+		threadends.at(i-1) = it;
 	}
 	// make sure the last one is realy the last
-	threadit.at(HASHTHREADCOUNT) = foundfiles.end();
+	threadends.at(HASHTHREADCOUNT-1) = foundfiles.end();
 
 	for(uint_fast8_t i = 0; i < HASHTHREADCOUNT; ++i) {
-		std::multimap<uint64_t, std::shared_ptr<File>>::iterator* itptr = &(threadit.at(i));
-		std::multimap<uint64_t, std::shared_ptr<File>>::iterator* endptr = &(threadit.at(i+1));
+		std::multimap<uint64_t, std::shared_ptr<File>>::iterator* itptr = &(threadits.at(i));
+		const std::multimap<uint64_t, std::shared_ptr<File>>::iterator* endptr = &(threadends.at(i));
 
 		threads.push_back(new HasherThread(
 			globalData,
-			[itptr, endptr]() -> std::shared_ptr<File> {
+			[itptr, endptr, i]() -> std::shared_ptr<File> {
 				if(*itptr != *endptr) {
-					auto copy = *itptr;
+					std::shared_ptr<File> value = (*itptr)->second;
 					++(*itptr);
-					return copy->second;
+					return value;
 				}
 				return nullptr;
 			},