diff --git a/subsys/net/lib/coap/coap_client.c b/subsys/net/lib/coap/coap_client.c
index 4f2297be958..7c49a90981b 100644
--- a/subsys/net/lib/coap/coap_client.c
+++ b/subsys/net/lib/coap/coap_client.c
@@ -894,7 +894,7 @@ static void coap_client_recv(void *coap_cl, void *a, void *b)
 		for (int i = 0; i < num_clients; i++) {
 			if (clients[i]->response_ready) {
 				struct coap_packet response;
-				bool response_truncated;
+				bool response_truncated = false;
 
 				k_mutex_lock(&clients[i]->lock, K_FOREVER);