diff --git a/flatdeb/collect-source-code b/flatdeb/collect-source-code
index c462e1cb025c4c13ce93ffdd1000852201518ae3..e84723004abb506b516f3e484f6885ecd9de67c6 100755
--- a/flatdeb/collect-source-code
+++ b/flatdeb/collect-source-code
@@ -310,6 +310,28 @@ def main():
 
     parent = args.output or os.path.join(args.sysroot, 'src', 'files')
 
+    with open(
+        os.path.join(parent, 'Sources'), 'w'
+    ) as writer:
+        subprocess.check_call(in_chroot + [
+            'sh', '-euc',
+            'dir="$1"; shift; mkdir -p "$dir"; cd "$dir"; "$@"',
+            'sh',                       # argv[0]
+            '/src/files',               # working directory
+            'dpkg-scansources',
+            '.',
+        ], stdout=writer)
+
+    with open(
+        os.path.join(parent, 'Sources.gz'), 'wb'
+    ) as binary_writer:
+        subprocess.check_call([
+            'pigz', '-c', '-n', '--rsyncable',
+            os.path.join(parent, 'Sources'),
+        ], stdout=binary_writer)
+
+    os.remove(os.path.join(parent, 'Sources'))
+
     try:
         with open(
             os.path.join(parent, 'sources.txt'), 'r'
diff --git a/flatdeb/debos-runtimes.yaml b/flatdeb/debos-runtimes.yaml
index eed8ef5f5ea93e36e5a606e959b924f1f18c748e..17e6e3be8bca2f7785430c8855cc9330c160ca8e 100644
--- a/flatdeb/debos-runtimes.yaml
+++ b/flatdeb/debos-runtimes.yaml
@@ -344,12 +344,12 @@ actions:
   - action: run
     label: list of included source code
     chroot: false
-    command: >
-      set -e;
-      cd "$ARTIFACTDIR";
-      dir="{{ or $sources_directory "$ROOTDIR/src/files" }}";
-      cp -v "$dir/sources.txt"
-      "{{ $sources_prefix }}.sources.txt"
+    command: |
+      set -e
+      cd "$ARTIFACTDIR"
+      dir="{{ or $sources_directory "$ROOTDIR/src/files" }}"
+      cp -v "$dir/Sources.gz" "{{ $sources_prefix }}.deb822.gz"
+      cp -v "$dir/sources.txt" "{{ $sources_prefix }}.sources.txt"
 
   - action: run
     label: list of missing source code
diff --git a/run.py b/run.py
index 8fc4ccb32427309b7a2dab4d388101fa0d4736a2..fa34b6186a75844ffedf7d702f5b3a9bcfb5a535 100755
--- a/run.py
+++ b/run.py
@@ -1131,6 +1131,11 @@ class Builder:
                         multiarch=True,
                     ))
 
+                    # We probably have this anyway, but we need it for
+                    # dpkg-scansources
+                    if 'dpkg-dev' not in sdk_packages:
+                        sdk_packages.append('dpkg-dev')
+
                     if sdk_packages:
                         logger.info('Installing extra packages for SDK:')
                         sdk_packages.sort()