diff --git a/stack.sh b/stack.sh
index 61f583deb9..158236107c 100755
--- a/stack.sh
+++ b/stack.sh
@@ -2294,7 +2294,7 @@ set +o xtrace
 if [[ -n "$LOGFILE" ]]; then
     exec 1>&3
     # Force all output to stdout and logs now
-    exec 1> >( tee "${LOGFILE}" ) 2>&1
+    exec 1> >( tee -a "${LOGFILE}" ) 2>&1
 else
     # Force all output to stdout now
     exec 1>&3