diff --git a/nrf5/drivers/pwm.c b/nrf5/drivers/pwm.c
index 77ef8be2ce..8d6ab0fa4f 100644
--- a/nrf5/drivers/pwm.c
+++ b/nrf5/drivers/pwm.c
@@ -24,6 +24,8 @@
  * THE SOFTWARE.
  */
 
+#include "py/mphal.h"
+
 #if MICROPY_PY_MACHINE_SOFT_PWM
 
 #include "stddef.h"