diff --git a/ovni.c b/ovni.c
index 3b766ee..f6b262c 100644
--- a/ovni.c
+++ b/ovni.c
@@ -176,7 +176,10 @@ proc_set_version(void)
 		die("json_value_get_object failed\n");
 
 	if(json_object_set_number(meta, "version", OVNI_METADATA_VERSION) != 0)
-		die("json_object_set_number for app_id failed\n");
+		die("json_object_set_number for version failed\n");
+
+	if(json_object_set_string(meta, "model_version", OVNI_MODEL_VERSION) != 0)
+		die("json_object_set_string for model_version failed\n");
 }
 
 
diff --git a/ovni.h b/ovni.h
index bcd8e85..b48d62a 100644
--- a/ovni.h
+++ b/ovni.h
@@ -50,6 +50,7 @@ typedef struct json_value_t  JSON_Value;
 
 #define OVNI_STREAM_MAGIC "ovni"
 #define OVNI_STREAM_VERSION 1
+#define OVNI_MODEL_VERSION "O1 V1 T1 M1 D1 K1"
 
 /* ----------------------- common ------------------------ */
 
diff --git a/trace.c b/trace.c
index 39e8101..491c8e9 100644
--- a/trace.c
+++ b/trace.c
@@ -146,6 +146,23 @@ check_metadata_version(struct ovni_eproc *proc)
 				proc->pid, version,
 				OVNI_METADATA_VERSION);
 	}
+
+	JSON_Value *mversion_val = json_object_get_value(meta, "model_version");
+	if(mversion_val == NULL)
+	{
+		die("process %d is missing attribute \"model_version\" in metadata\n",
+				proc->pid);
+	}
+
+	const char *mversion = json_string(mversion_val);
+
+	if(strcmp(mversion, OVNI_MODEL_VERSION) != 0)
+	{
+		die("pid %d: metadata model version mismatch '%s' (expected '%s')\n",
+				proc->pid, mversion,
+				OVNI_MODEL_VERSION);
+
+	}
 }
 
 static int