diff --git a/include/mbedtls/check_config.h b/include/mbedtls/check_config.h
index e00ffb5..3f4647a 100644
--- a/include/mbedtls/check_config.h
+++ b/include/mbedtls/check_config.h
@@ -839,6 +839,12 @@
 #error "MBEDTLS_SSL_CID_OUT_LEN_MAX too large (max 255)"
 #endif
 
+#if !defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)            &&                 \
+    defined(MBEDTLS_SSL_DTLS_CONNECTION_ID_COMPAT)
+#error "MBEDTLS_SSL_DTLS_CONNECTION_ID_COMPAT defined, but not all prerequsites"
+#endif
+
+
 #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) &&   \
     !defined(MBEDTLS_SSL_PROTO_TLS1_2)
 #error "MBEDTLS_SSL_ENCRYPT_THEN_MAC defined, but not all prerequisites"