diff --git a/minethd.cpp b/minethd.cpp
index fd83e82a..5c7871d2 100644
--- a/minethd.cpp
+++ b/minethd.cpp
@@ -150,7 +150,7 @@ void telemetry::push_perf_value(size_t iThd, uint64_t iHashCount, uint64_t iTime
 	iBucketTop[iThd] = (iTop + 1) & iBucketMask;
 }
 
-minethd::minethd(miner_work& pWork, size_t iNo, bool double_work, bool no_prefetch, int affinity)
+minethd::minethd(miner_work& pWork, size_t iNo, bool double_work, bool no_prefetch, int64_t affinity)
 {
 	oWork = pWork;
 	bQuit = 0;
@@ -307,15 +307,6 @@ std::vector<minethd*>* minethd::thread_starter(miner_work& pWork)
 		jconf::inst()->GetThreadConfig(i, cfg);
 
 		minethd* thd = new minethd(pWork, i, cfg.bDoubleMode, cfg.bNoPrefetch, cfg.iCpuAff);
-
-		if(cfg.iCpuAff >= 0)
-		{
-#if defined(__APPLE__)
-			printer::inst()->print_msg(L1, "WARNING on MacOS thread affinity is only advisory.");
-#endif
-			thd_setaffinity(thd->oWorkThd.native_handle(), cfg.iCpuAff);
-		}
-
 		pvThreads->push_back(thd);
 
 		if(cfg.iCpuAff >= 0)
@@ -370,11 +361,22 @@ minethd::cn_hash_fun minethd::func_selector(bool bHaveAes, bool bNoPrefetch)
 	return func_table[digit.to_ulong()];
 }
 
-void minethd::work_main()
+void minethd::pin_thd_affinity()
 {
 	// pin memory to NUMA node
 	bindMemoryToNUMANode(affinity);
 
+#if defined(__APPLE__)
+	printer::inst()->print_msg(L1, "WARNING on MacOS thread affinity is only advisory.");
+#endif
+	thd_setaffinity(oWorkThd.native_handle(), affinity);
+}
+
+void minethd::work_main()
+{
+	if(affinity >= 0) //-1 means no affinity
+		pin_thd_affinity();
+
 	cn_hash_fun hash_fun;
 	cryptonight_ctx* ctx;
 	uint64_t iCount = 0;
@@ -462,8 +464,8 @@ minethd::cn_hash_fun_dbl minethd::func_dbl_selector(bool bHaveAes, bool bNoPrefe
 
 void minethd::double_work_main()
 {
-	// pin memory to NUMA node
-	bindMemoryToNUMANode(affinity);
+	if(affinity >= 0) //-1 means no affinity
+		pin_thd_affinity();
 
 	cn_hash_fun_dbl hash_fun;
 	cryptonight_ctx* ctx0;
diff --git a/minethd.h b/minethd.h
index 3543b85f..3c88c267 100644
--- a/minethd.h
+++ b/minethd.h
@@ -97,13 +97,11 @@ class minethd
 	std::atomic<uint64_t> iHashCount;
 	std::atomic<uint64_t> iTimestamp;
 
-	int affinity;
-
 private:
 	typedef void (*cn_hash_fun)(const void*, size_t, void*, cryptonight_ctx*);
 	typedef void (*cn_hash_fun_dbl)(const void*, size_t, void*, cryptonight_ctx* __restrict, cryptonight_ctx* __restrict);
 
-	minethd(miner_work& pWork, size_t iNo, bool double_work, bool no_prefetch, int affinity);
+	minethd(miner_work& pWork, size_t iNo, bool double_work, bool no_prefetch, int64_t affinity);
 
 	// We use the top 10 bits of the nonce for thread and resume
 	// This allows us to resume up to 128 threads 4 times before
@@ -131,8 +129,11 @@ class minethd
 	static miner_work oGlobalWork;
 	miner_work oWork;
 
+	void pin_thd_affinity();
+
 	std::thread oWorkThd;
 	uint8_t iThreadNo;
+	int64_t affinity;
 
 	bool bQuit;
 	bool bNoPrefetch;