diff --git a/library/ssl_tls.c b/library/ssl_tls.c
index c85291e..4878585 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -990,6 +990,7 @@
 
 #if !defined(MBEDTLS_SSL_HW_RECORD_ACCEL) && \
     !defined(MBEDTLS_SSL_EXPORT_KEYS) && \
+    !defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) && \
     !defined(MBEDTLS_DEBUG_C)
     ssl = NULL; /* make sure we don't use it except for those cases */
     (void) ssl;