diff --git a/.gitlab-ci/debug-aws.patch b/.gitlab-ci/debug-aws.patch
index a7583c295..f4a250b96 100644
--- a/.gitlab-ci/debug-aws.patch
+++ b/.gitlab-ci/debug-aws.patch
@@ -1,3 +1,16 @@
+diff --git a/src/libstore/filetransfer.cc b/src/libstore/filetransfer.cc
+index 514ab3bf9..25dab18bb 100644
+--- a/src/libstore/filetransfer.cc
++++ b/src/libstore/filetransfer.cc
+@@ -696,6 +696,8 @@ struct curlFileTransfer : public FileTransfer
+                 std::string scheme = get(params, "scheme").value_or("");
+                 std::string endpoint = get(params, "endpoint").value_or("");
+ 
++                debug("enqueueFileTransfer: scheme: %s", scheme);
++
+                 S3Helper s3Helper(profile, region, scheme, endpoint);
+ 
+                 // FIXME: implement ETag
 diff --git a/src/libstore/s3-binary-cache-store.cc b/src/libstore/s3-binary-cache-store.cc
 index 6bfbee044..ff406e5e4 100644
 --- a/src/libstore/s3-binary-cache-store.cc