diff --git a/ports/esp32/modesp32.h b/ports/esp32/modesp32.h
index 60c386565b..6b6a6578a7 100644
--- a/ports/esp32/modesp32.h
+++ b/ports/esp32/modesp32.h
@@ -32,6 +32,21 @@
     )
     #define RTC_LAST_EXT_PIN 21
 
+#elif CONFIG_IDF_TARGET_ESP32C6
+
+    #define RTC_VALID_EXT_PINS \
+    ( \
+    (1ll << 0) | \
+    (1ll << 1) | \
+    (1ll << 2) | \
+    (1ll << 3) | \
+    (1ll << 4) | \
+    (1ll << 5) | \
+    (1ll << 6) | \
+    (1ll << 7)   \
+    )
+    #define RTC_LAST_EXT_PIN 7
+
 #else
 
     #define RTC_VALID_EXT_PINS \