diff --git a/test/utils.py b/test/utils.py
index 5be952d0..2c1025b4 100644
--- a/test/utils.py
+++ b/test/utils.py
@@ -37,7 +37,10 @@ def cibuildwheel_get_build_identifiers(project_path, env=None):
         env=env,
     )
 
-    return cmd_output.strip().split('\n')
+    lines = cmd_output.strip().split('\n')
+
+    # ignore warning lines in output
+    return [l for l in lines if l != '' and not l.startswith('Warning ')]
 
 
 def cibuildwheel_run(project_path, package_dir='.', env=None, add_env=None, output_dir=None):