diff --git a/intern/cycles/device/device_cpu.cpp b/intern/cycles/device/device_cpu.cpp
index 16908b0244a..96aeeaa8081 100644
--- a/intern/cycles/device/device_cpu.cpp
+++ b/intern/cycles/device/device_cpu.cpp
@@ -719,8 +719,8 @@ public:
 		int start_sample = tile.start_sample;
 		int end_sample = tile.start_sample + tile.num_samples;
 
-		_MM_SET_FLUSH_ZERO_MODE(_MM_FLUSH_ZERO_ON);
-		_MM_SET_DENORMALS_ZERO_MODE(_MM_DENORMALS_ZERO_ON);
+// n/a to arm		_MM_SET_FLUSH_ZERO_MODE(_MM_FLUSH_ZERO_ON);
+// n/a to arm		_MM_SET_DENORMALS_ZERO_MODE(_MM_DENORMALS_ZERO_ON);
 
 		for(int sample = start_sample; sample < end_sample; sample++) {
 			if(task.get_cancel() || task_pool.canceled()) {