diff --git a/src/storage/s3.js b/src/storage/s3.js
index cebff16bd..139e223a5 100644
--- a/src/storage/s3.js
+++ b/src/storage/s3.js
@@ -364,12 +364,12 @@ async function listDir(config, remotePath, batchSize, marker) {
 // See aws-sdk-js/issues/1302
 function encodeCopySource(bucket, path) {
     // AWS percent-encodes some extra non-standard characters in a URI
-    const output = encodeURI(path).replace(/[+!"#$@&'()*+,:;=?@]/g, function(ch) {
+    const output = encodeURI(path).replace(/[+!"#$@&'()*,:;=?@]/g, function(ch) {
         return '%' + ch.charCodeAt(0).toString(16).toUpperCase();
     });
 
-    // the slash at the beginning is optional
-    return `/${bucket}/${output}`;
+    // the slash at the beginning is optional. adding it breaks atleast intercolo.de
+    return `${bucket}/${output}`;
 }
 
 async function copyInternal(config, fullFromPath, fullToPath, fileSize, progressCallback) {