diff --git a/scripts/install b/scripts/install
index 214faed..0ca5d72 100755
--- a/scripts/install
+++ b/scripts/install
@@ -151,7 +151,7 @@ sudo cp ../conf/robots.txt $final_path
 runninguser="${app}-ynh"
 # 1.  Create the user
 # Create a system account for COPS if it doesn't already exists
-test="$(grep ^${runninguser}: /etc/passwd)"
+test="$(sudo grep ^${runninguser}: /etc/passwd)"
 if [ -n "${test}" ]; then
     echo "The user $runninguser does not exist, we can create it"
     sudo useradd -c "$runninguser system account" \
diff --git a/scripts/restore b/scripts/restore
index db1e060..a7009be 100755
--- a/scripts/restore
+++ b/scripts/restore
@@ -45,7 +45,7 @@ sudo cp -a ./sources/* $final_path/
 runninguser="${app}-ynh"
 # 1.  Create the user
 # Create a system account for COPS if it doesn't already exists
-test="$(grep ^${runninguser}: /etc/passwd)"
+test="$(sudo grep ^${runninguser}: /etc/passwd)"
 if [ -n "${test}" ]; then
     echo "The user $runninguser does not exist, we can create it"
     sudo useradd -c "$runninguser system account" \
diff --git a/scripts/upgrade b/scripts/upgrade
index 394a4af..a9ed45b 100755
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -83,7 +83,7 @@ sudo cp ../conf/robots.txt $final_path
 runninguser="${app}-ynh"
 # 1.  Create the user
 # Create a system account for COPS if it doesn't already exists
-test="$(grep ^${runninguser}: /etc/passwd)"
+test="$(sudo grep ^${runninguser}: /etc/passwd)"
 if [ -n "${test}" ]; then
     echo "The user $runninguser does not exist, we can create it"
     sudo useradd -c "$runninguser system account" \