diff --git a/data/helpers.d/apt b/data/helpers.d/apt
index dcea0c976..03be6495c 100644
--- a/data/helpers.d/apt
+++ b/data/helpers.d/apt
@@ -10,6 +10,7 @@
 # Requires YunoHost version 3.3.1 or higher.
 ynh_wait_dpkg_free() {
     local try
+    set +o xtrace # set +x
     # With seq 1 17, timeout will be almost 30 minutes
     for try in `seq 1 17`
     do
@@ -32,13 +33,16 @@ ynh_wait_dpkg_free() {
                 then
                     # If so, that a remaining of dpkg.
                     ynh_print_err "E: dpkg was interrupted, you must manually run 'sudo dpkg --configure -a' to correct the problem."
+                    set -o xtrace # set -x
                     return 1
                 fi
             done 9<<< "$(ls -1 $dpkg_dir)"
+            set -o xtrace # set -x
             return 0
         fi
     done
     echo "apt still used, but timeout reached !"
+    set -o xtrace # set -x
 }
 
 # Check either a package is installed or not