diff --git a/tests/hwsim/README b/tests/hwsim/README
index 91aa6f90e..8195aa40a 100644
--- a/tests/hwsim/README
+++ b/tests/hwsim/README
@@ -60,11 +60,8 @@ wpaspy
 ------
 
 The python scripts use wpaspy.py to interact with the wpa_supplicant
-control interface. This needs to be installed in a way that python can
-find it. For example, with this command:
-
-sudo cp ../wpaspy/wpaspy.py /usr/local/lib/python2.7/dist-packages
-
+control interface, but the run-tests.py script adds the (relative)
+path into the environment so it doesn't need to be installed.
 
 
 mac80211_hwsim
diff --git a/tests/hwsim/run-tests.py b/tests/hwsim/run-tests.py
index 4b1750bb6..abe26f359 100755
--- a/tests/hwsim/run-tests.py
+++ b/tests/hwsim/run-tests.py
@@ -16,6 +16,8 @@ from datetime import datetime
 import logging
 logger = logging.getLogger(__name__)
 
+sys.path.append('../../wpaspy')
+
 from wpasupplicant import WpaSupplicant
 from hostapd import HostapdGlobal