diff --git a/configure.py b/configure.py
index 45c9b3b..1d0b2e7 100755
--- a/configure.py
+++ b/configure.py
@@ -7,6 +7,7 @@
 signal(SIGPIPE, SIG_DFL)
 
 NUM_PROJECTS = 498
+filler_project_url = 'https://github.com/mattvenn/wokwi_filler'
 
 
 class Projects():
@@ -26,9 +27,9 @@
                 logging.error("project cache {} not found, use --update-cache to build it".format(Projects.projects_db))
 
     def update_cache(self):
-        from project_urls import urls
+        from project_urls import project_urls
         self.wokwi_ids = []
-        for url in urls:
+        for url in [filler_project_url] + project_urls:
             self.wokwi_ids.append(self.install_artifacts(url))
 
         # cache it
diff --git a/project_urls.py b/project_urls.py
index 0bcff2b..1ea03e8 100644
--- a/project_urls.py
+++ b/project_urls.py
@@ -1,6 +1,5 @@
 # name must be valid verilog module name set in scan_wrapper.v
-urls = [
-            'https://github.com/mattvenn/wokwi_filler',
+project_urls = [
             'https://github.com/mattvenn/wokwi-verilog-gds-test',
             'https://github.com/mattvenn/animation_tinytapeout_demo',
             'https://github.com/mattvenn/wokwi_inverters',