diff --git a/ports/stm32/led.c b/ports/stm32/led.c
index 9231718846..adcb240cc0 100644
--- a/ports/stm32/led.c
+++ b/ports/stm32/led.c
@@ -141,9 +141,11 @@ STATIC void led_pwm_init(int led) {
         case 2:
             __TIM2_CLK_ENABLE();
             break;
+        #if defined(TIM3)
         case 3:
             __TIM3_CLK_ENABLE();
             break;
+        #endif
         default:
             assert(0);
     }