diff --git a/ports/esp32/boards/sdkconfig.base b/ports/esp32/boards/sdkconfig.base
index 6526a80355..5bd9b1aa6c 100644
--- a/ports/esp32/boards/sdkconfig.base
+++ b/ports/esp32/boards/sdkconfig.base
@@ -51,6 +51,9 @@ CONFIG_LWIP_PPP_CHAP_SUPPORT=y
 # Use 4kiB output buffer instead of default 16kiB
 CONFIG_MBEDTLS_ASYMMETRIC_CONTENT_LEN=y
 
+# Disable ALPN support as it's not implemented in MicroPython
+CONFIG_MBEDTLS_SSL_ALPN=n
+
 # Allow mbedTLS to allocate from PSRAM or internal memory
 #
 # (The ESP-IDF default is internal-only, partly for physical security to prevent