diff --git a/Source/FanControl.cpp b/Source/FanControl.cpp
index b7919a4..75160d3 100644
--- a/Source/FanControl.cpp
+++ b/Source/FanControl.cpp
@@ -23,7 +23,7 @@ extern "C" void TIM14_IRQHandler(void)
 }
 extern "C" void FanControl_SetDuty(uint32_t d)
 {
-  duty = TIMER_RELOAD_VALUE / 100UL * d;
+  duty = TIMER_RELOAD_VALUE * d / 100UL ;
 }
 namespace ElektronischeLast
 {
@@ -127,6 +127,6 @@ namespace ElektronischeLast
    */
   std::uint32_t FanControl::get_speed(void)
   {
-    return fan_speed *60UL / 2UL;
+    return fan_speed * 60UL / 2UL;
   }
 }