diff --git a/sphinx_d2lang/d2lang.py b/sphinx_d2lang/d2lang.py
index 1588eed..2819bd1 100644
--- a/sphinx_d2lang/d2lang.py
+++ b/sphinx_d2lang/d2lang.py
@@ -8,6 +8,7 @@ from pathlib import Path
 import shlex
 import subprocess
 import tempfile
+import uuid
 
 class D2langDirective(SphinxDirective):
     required_arguments = 0
@@ -24,7 +25,7 @@ class D2langDirective(SphinxDirective):
         if 'filename' in self.options:
             output_fname = self.options.get('filename')
         else:
-            output_fname = 'test.svg'
+            output_fname = "d2lang_svg/" + str(uuid.uuid4())
         if 'layout' in self.options:
             layout = self.options.get('layout')
         else: