diff --git a/lib/tls/mbedtls/wrapper/platform/ssl_pm.c b/lib/tls/mbedtls/wrapper/platform/ssl_pm.c
index f67da544f..04354f6b4 100755
--- a/lib/tls/mbedtls/wrapper/platform/ssl_pm.c
+++ b/lib/tls/mbedtls/wrapper/platform/ssl_pm.c
@@ -888,6 +888,8 @@ void SSL_get0_alpn_selected(const SSL *ssl, const unsigned char **data,
 		*len = (unsigned int)strlen(alp);
 	else
 		*len = 0;
+#else
+	*len = 0;
 #endif
 }