diff --git a/plinth/tests/functional/install.sh b/plinth/tests/functional/install.sh
index 678e7b768..a51cfbb1c 100755
--- a/plinth/tests/functional/install.sh
+++ b/plinth/tests/functional/install.sh
@@ -4,8 +4,8 @@ IFS=$'\n\t'
 
 echo "Installing requirements"
 sudo apt-get install -yq --no-install-recommends \
-    python3-pytest python3-pytest-django python3-pytest-xdist \
-    python3-pip python3-wheel firefox-esr git smbclient
+    python3-pytest python3-pytest-django python3-pytest-instafail \
+    python3-pytest-xdist python3-pip python3-wheel firefox-esr git smbclient
 
 # Use compatible versions of Splinter and Selenium
 PIP_VERSION=$(dpkg-query -W -f '${Version}' python3-pip)