diff --git a/tests/hwsim/run-all.sh b/tests/hwsim/run-all.sh
index fab475115..ee29480b3 100755
--- a/tests/hwsim/run-all.sh
+++ b/tests/hwsim/run-all.sh
@@ -1,6 +1,7 @@
 #!/bin/sh
 
 errors=0
+umask 0002
 ./start-p2p.sh
 ./run-p2p-tests.py || errors=1
 ./start-ap.sh