diff --git a/lib/documents.js b/lib/documents.js
index e503ab1..7f2c62c 100644
--- a/lib/documents.js
+++ b/lib/documents.js
@@ -1073,7 +1073,12 @@ function composeLetter(doc, S, dry, cur, { letter, header, job, anlagen, signatu
   //     the reserved bottom margin so it never collides with the body. ---
   if (!dry) {
     const parts = [];
-    if (header.adresse) parts.push(String(header.adresse).replace(/\s*,\s*/g, ', '));
+    // Flatten a possibly multi-line address (newlines and/or commas) to one
+    // line — doc.text breaks on \n, which would stack the street above the city.
+    if (header.adresse) {
+      const adr = String(header.adresse).split(/[\n,]/).map((s) => s.trim()).filter(Boolean).join(', ');
+      if (adr) parts.push(adr);
+    }
     if (header.telefon) parts.push(header.telefon);
     if (header.email) parts.push(header.email);
     if (parts.length) {