diff --git a/inc/drivers/DynamicPwm.h b/inc/drivers/DynamicPwm.h
index 3290eec..441f048 100644
--- a/inc/drivers/DynamicPwm.h
+++ b/inc/drivers/DynamicPwm.h
@@ -40,7 +40,7 @@ DEALINGS IN THE SOFTWARE.
 class DynamicPwm : public PwmOut
 {
     private:
-    uint32_t period;
+    static uint32_t period;
     float lastValue;
 
     public:
diff --git a/source/drivers/DynamicPwm.cpp b/source/drivers/DynamicPwm.cpp
index 9e67aba..ac9d981 100644
--- a/source/drivers/DynamicPwm.cpp
+++ b/source/drivers/DynamicPwm.cpp
@@ -35,6 +35,8 @@ DEALINGS IN THE SOFTWARE.
 #include "MicroBitPin.h"
 #include "ErrorNo.h"
 
+uint32_t DynamicPwm::period = MICROBIT_DEFAULT_PWM_PERIOD;
+
 /**
   * An internal constructor used when allocating a new DynamicPwm instance.
   *
@@ -45,7 +47,6 @@ DEALINGS IN THE SOFTWARE.
   */
 DynamicPwm::DynamicPwm(PinName pin) : PwmOut(pin)
 {
-    this->period = 0;
 }
 
 /**
@@ -131,7 +132,7 @@ int DynamicPwm::getValue()
   */
 uint32_t DynamicPwm::getPeriodUs()
 {
-    return period;
+    return this->period;
 }
 
 /**