diff --git a/lib/nodes/ngsi.cpp b/lib/nodes/ngsi.cpp
index 951ff3c04..5c03be593 100644
--- a/lib/nodes/ngsi.cpp
+++ b/lib/nodes/ngsi.cpp
@@ -518,7 +518,7 @@ int ngsi_request_context_query(CURL *handle, const char *endpoint, json_t *json_
 	char *reason;
 
 	json_t *json_response;
-	json_t *json_request = json_pack("{ s: [ o ] }", "entities", json_entity);
+	json_t *json_request = json_pack("{ s: [ O ] }", "entities", json_entity);
 
 	ret = ngsi_request(handle, endpoint, "queryContext", json_request, &json_response, logger);
 	if (ret) {
@@ -543,7 +543,7 @@ int ngsi_request_context_update(CURL *handle, const char *endpoint, const char *
 	char *reason;
 
 	json_t *json_response;
-	json_t *json_request = json_pack("{ s: s, s: [ o ] }",
+	json_t *json_request = json_pack("{ s: s, s: [ O ] }",
 		"updateAction", action,
 		"contextElements", json_entity
 	);
diff --git a/lib/socket_addr.cpp b/lib/socket_addr.cpp
index bc26398a2..0b18425b3 100644
--- a/lib/socket_addr.cpp
+++ b/lib/socket_addr.cpp
@@ -25,7 +25,7 @@ using namespace villas::utils;
 char * villas::node::socket_print_addr(struct sockaddr *saddr)
 {
 	union sockaddr_union *sa = (union sockaddr_union *) saddr;
-	char *buf = new char[256];
+	auto *buf = reinterpret_cast<char *>(::malloc(256));
 	if (!buf)
 		throw MemoryAllocationError();