diff --git a/tools/buildgen/generate_projects.py b/tools/buildgen/generate_projects.py
index 6ea4a05dea552ad083c1947abadfc809189fe01b..1964ceb665d8fb86aeca7a958de105d27f4a464d 100755
--- a/tools/buildgen/generate_projects.py
+++ b/tools/buildgen/generate_projects.py
@@ -62,7 +62,9 @@ for root, dirs, files in os.walk('templates'):
 			if test is None:
 				cmd.append(out)
 			else:
-				test[out] = tempfile.mkstemp()
+				tf = tempfile.mkstemp()
+				test[out] = tf[1]
+				os.close(tf[0])
 				cmd.append(test[out])
 			cmd.append(root + '/' + f)
 			jobs.append(jobset.JobSpec(cmd, shortname=out))