diff --git a/ports/esp32/machine_pin.c b/ports/esp32/machine_pin.c
index 90dc03e69a..c22eb5d847 100644
--- a/ports/esp32/machine_pin.c
+++ b/ports/esp32/machine_pin.c
@@ -92,7 +92,11 @@ STATIC const machine_pin_obj_t machine_pin_obj[] = {
     #endif
     {{&machine_pin_type}, GPIO_NUM_18},
     {{&machine_pin_type}, GPIO_NUM_19},
+    #if ESP_IDF_VERSION >= ESP_IDF_VERSION_VAL(4, 1, 0)
+    {{&machine_pin_type}, GPIO_NUM_20},
+    #else
     {{NULL}, -1},
+    #endif
     {{&machine_pin_type}, GPIO_NUM_21},
     {{&machine_pin_type}, GPIO_NUM_22},
     {{&machine_pin_type}, GPIO_NUM_23},
@@ -560,7 +564,11 @@ STATIC const machine_pin_irq_obj_t machine_pin_irq_object[] = {
     #endif
     {{&machine_pin_irq_type}, GPIO_NUM_18},
     {{&machine_pin_irq_type}, GPIO_NUM_19},
+    #if ESP_IDF_VERSION >= ESP_IDF_VERSION_VAL(4, 1, 0)
+    {{&machine_pin_irq_type}, GPIO_NUM_20},
+    #else
     {{NULL}, -1},
+    #endif
     {{&machine_pin_irq_type}, GPIO_NUM_21},
     {{&machine_pin_irq_type}, GPIO_NUM_22},
     {{&machine_pin_irq_type}, GPIO_NUM_23},