diff --git a/lib/formats/villas.pb-c.c b/lib/formats/villas.pb-c.c
index 500bafdd2..0266a9cd6 100644
--- a/lib/formats/villas.pb-c.c
+++ b/lib/formats/villas.pb-c.c
@@ -10,7 +10,7 @@
 void   villas__node__message__init
                      (Villas__Node__Message         *message)
 {
-  static Villas__Node__Message init_value = VILLAS__NODE__MESSAGE__INIT;
+  static const Villas__Node__Message init_value = VILLAS__NODE__MESSAGE__INIT;
   *message = init_value;
 }
 size_t villas__node__message__get_packed_size
@@ -47,13 +47,15 @@ void   villas__node__message__free_unpacked
                      (Villas__Node__Message *message,
                       ProtobufCAllocator *allocator)
 {
+  if(!message)
+    return;
   assert(message->base.descriptor == &villas__node__message__descriptor);
   protobuf_c_message_free_unpacked ((ProtobufCMessage*)message, allocator);
 }
 void   villas__node__sample__init
                      (Villas__Node__Sample         *message)
 {
-  static Villas__Node__Sample init_value = VILLAS__NODE__SAMPLE__INIT;
+  static const Villas__Node__Sample init_value = VILLAS__NODE__SAMPLE__INIT;
   *message = init_value;
 }
 size_t villas__node__sample__get_packed_size
@@ -90,13 +92,15 @@ void   villas__node__sample__free_unpacked
                      (Villas__Node__Sample *message,
                       ProtobufCAllocator *allocator)
 {
+  if(!message)
+    return;
   assert(message->base.descriptor == &villas__node__sample__descriptor);
   protobuf_c_message_free_unpacked ((ProtobufCMessage*)message, allocator);
 }
 void   villas__node__timestamp__init
                      (Villas__Node__Timestamp         *message)
 {
-  static Villas__Node__Timestamp init_value = VILLAS__NODE__TIMESTAMP__INIT;
+  static const Villas__Node__Timestamp init_value = VILLAS__NODE__TIMESTAMP__INIT;
   *message = init_value;
 }
 size_t villas__node__timestamp__get_packed_size
@@ -133,13 +137,15 @@ void   villas__node__timestamp__free_unpacked
                      (Villas__Node__Timestamp *message,
                       ProtobufCAllocator *allocator)
 {
+  if(!message)
+    return;
   assert(message->base.descriptor == &villas__node__timestamp__descriptor);
   protobuf_c_message_free_unpacked ((ProtobufCMessage*)message, allocator);
 }
 void   villas__node__value__init
                      (Villas__Node__Value         *message)
 {
-  static Villas__Node__Value init_value = VILLAS__NODE__VALUE__INIT;
+  static const Villas__Node__Value init_value = VILLAS__NODE__VALUE__INIT;
   *message = init_value;
 }
 size_t villas__node__value__get_packed_size
@@ -176,6 +182,8 @@ void   villas__node__value__free_unpacked
                      (Villas__Node__Value *message,
                       ProtobufCAllocator *allocator)
 {
+  if(!message)
+    return;
   assert(message->base.descriptor == &villas__node__value__descriptor);
   protobuf_c_message_free_unpacked ((ProtobufCMessage*)message, allocator);
 }
diff --git a/lib/formats/villas.pb-c.h b/lib/formats/villas.pb-c.h
index 471cce2a0..557064744 100644
--- a/lib/formats/villas.pb-c.h
+++ b/lib/formats/villas.pb-c.h
@@ -10,7 +10,7 @@ PROTOBUF_C__BEGIN_DECLS
 
 #if PROTOBUF_C_VERSION_NUMBER < 1000000
 # error This file was generated by a newer version of protoc-c which is incompatible with your libprotobuf-c headers. Please update your headers.
-#elif 1002001 < PROTOBUF_C_MIN_COMPILER_VERSION
+#elif 1003000 < PROTOBUF_C_MIN_COMPILER_VERSION
 # error This file was generated by an older version of protoc-c which is incompatible with your libprotobuf-c headers. Please regenerate this file with a newer version of protoc-c.
 #endif
 
@@ -67,7 +67,7 @@ struct  _Villas__Node__Sample
 };
 #define VILLAS__NODE__SAMPLE__INIT \
  { PROTOBUF_C_MESSAGE_INIT (&villas__node__sample__descriptor) \
-    , VILLAS__NODE__SAMPLE__TYPE__DATA, 0,0, NULL, 0,NULL }
+    , VILLAS__NODE__SAMPLE__TYPE__DATA, 0, 0, NULL, 0,NULL }
 
 
 struct  _Villas__Node__Timestamp
@@ -90,7 +90,8 @@ struct  _Villas__Node__Timestamp
 typedef enum {
   VILLAS__NODE__VALUE__VALUE__NOT_SET = 0,
   VILLAS__NODE__VALUE__VALUE_F = 1,
-  VILLAS__NODE__VALUE__VALUE_I = 2,
+  VILLAS__NODE__VALUE__VALUE_I = 2
+    PROTOBUF_C__FORCE_ENUM_TO_BE_INT_SIZE(VILLAS__NODE__VALUE__VALUE)
 } Villas__Node__Value__ValueCase;
 
 struct  _Villas__Node__Value