diff --git a/debian/changelog b/debian/changelog
index 154caa2..f69d6af 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -3,6 +3,10 @@ kunitconversion (5.78.0-3) UNRELEASED; urgency=medium
   [ Norbert Preining ]
   * Remove graphviz from build depends.
 
+  [ Debian Janitor ]
+  * Apply multi-arch hints.
+    + libkf5unitconversion-dev: Add Multi-Arch: same.
+
  -- Debian Qt/KDE Maintainers <debian-qt-kde@lists.debian.org>  Sat, 23 Jan 2021 10:28:23 +0900
 
 kunitconversion (5.78.0-2) unstable; urgency=medium
diff --git a/debian/control b/debian/control
index 806d888..e5e4580 100644
--- a/debian/control
+++ b/debian/control
@@ -44,6 +44,7 @@ Description: development files for kunitconversion
  .
  Contains development files for kunitconversion.
 Breaks: libkf5kdelibs4support-dev (<< 5.54)
+Multi-Arch: same
 
 Package: libkf5unitconversion-doc
 Architecture: all