diff --git a/debian/postinst b/debian/postinst
index ecd148a4c..0d540a673 100644
--- a/debian/postinst
+++ b/debian/postinst
@@ -2,7 +2,9 @@
 
 case "$1" in
   configure)
-      adduser --system --group --home /var/lib/zerotier-one --no-create-home zerotier-one
+      if ! id zerotier-one >>/dev/null 2>&1; then
+        adduser --system --group --home /var/lib/zerotier-one --no-create-home zerotier-one
+      fi
       ;;
 esac