diff --git a/californium-core/src/main/java/org/eclipse/californium/core/config/CoapConfig.java b/californium-core/src/main/java/org/eclipse/californium/core/config/CoapConfig.java
index 48df20da7c..1ac6465fca 100644
--- a/californium-core/src/main/java/org/eclipse/californium/core/config/CoapConfig.java
+++ b/californium-core/src/main/java/org/eclipse/californium/core/config/CoapConfig.java
@@ -802,6 +802,7 @@ public void applyDefinitions(Configuration config) {
 			config.set(COAP_SECURE_PORT, CoAP.DEFAULT_COAP_SECURE_PORT);
 
 			config.set(ACK_TIMEOUT, 2000, TimeUnit.MILLISECONDS);
+			config.set(MAX_ACK_TIMEOUT, 60000, TimeUnit.MILLISECONDS);
 			config.set(ACK_INIT_RANDOM, 1.5f);
 			config.set(ACK_TIMEOUT_SCALE, 2f);
 			config.set(MAX_RETRANSMIT, 4);