diff --git a/debian/changelog b/debian/changelog
index da37368..0508718 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -2,6 +2,7 @@
 
   * Bump Standards-Version to 4.3.0, no changes.
   * Add Build-Depends-Package field to symbols file.
+  * Update gbp.conf to use --source-only-changes by default.
 
  -- Bas Couwenberg <sebastic@debian.org>  Sun, 05 Aug 2018 20:56:27 +0200
 
diff --git a/debian/gbp.conf b/debian/gbp.conf
index 21d0417..e3daba6 100644
--- a/debian/gbp.conf
+++ b/debian/gbp.conf
@@ -14,3 +14,6 @@
 
 # Always use pristine-tar.
 pristine-tar = True
+
+[buildpackage]
+pbuilder-options = --source-only-changes