diff --git a/tests/functional/common/vars-and-functions.sh.in b/tests/functional/common/vars-and-functions.sh.in
index 0739ff8e9..8202402b3 100644
--- a/tests/functional/common/vars-and-functions.sh.in
+++ b/tests/functional/common/vars-and-functions.sh.in
@@ -144,7 +144,7 @@ restartDaemon() {
     startDaemon
 }
 
-if [[ $(uname) == Linux ]] && [[ -L /proc/self/ns/user ]] && unshare --user true; then
+if [[ $(uname) == Linux ]] && [[ -L /proc/self/ns/user ]] && unshare --user --mount --pid true; then
     _canUseSandbox=1
 fi