diff --git a/shared-bindings/wifi/Radio.c b/shared-bindings/wifi/Radio.c
index aecb1b561f..3238025622 100644
--- a/shared-bindings/wifi/Radio.c
+++ b/shared-bindings/wifi/Radio.c
@@ -89,7 +89,7 @@ STATIC mp_obj_t wifi_radio_set_hostname(mp_obj_t self_in, mp_obj_t hostname_in)
 
     mp_arg_validate_length_range(hostname.len, 1, 253, MP_QSTR_hostname);
 
-    #if 0 // ndef CONFIG_IDF_TARGET_ESP32C3
+    #if !(defined(CONFIG_IDF_TARGET_ESP32C3) || defined(RASPBERRYPI))
     regex_t regex; // validate hostname according to RFC 1123
     regcomp(&regex,"^(([a-z0-9]|[a-z0-9][a-z0-9\\-]{0,61}[a-z0-9])\\.)*([a-z0-9]|[a-z0-9][a-z0-9\\-]{0,61}[a-z0-9])$", REG_EXTENDED | REG_ICASE | REG_NOSUB);
     if (regexec(&regex, hostname.buf, 0, NULL, 0)) {