diff -Nru laszip-3.4.1/debian/changelog laszip-3.4.1/debian/changelog
--- laszip-3.4.1/debian/changelog	2019-05-19 15:14:17.000000000 +0000
+++ laszip-3.4.1/debian/changelog	2019-07-07 06:25:03.000000000 +0000
@@ -1,3 +1,9 @@
+laszip (3.4.1-2) unstable; urgency=medium
+
+  * Update gbp.conf to use --source-only-changes by default.
+
+ -- Bas Couwenberg <sebastic@debian.org>  Sun, 07 Jul 2019 08:25:03 +0200
+
 laszip (3.4.1-1) unstable; urgency=medium
 
   * Move from experimental to unstable.
diff -Nru laszip-3.4.1/debian/gbp.conf laszip-3.4.1/debian/gbp.conf
--- laszip-3.4.1/debian/gbp.conf	2019-04-01 20:03:05.000000000 +0000
+++ laszip-3.4.1/debian/gbp.conf	2019-07-07 06:18:59.000000000 +0000
@@ -14,3 +14,6 @@
 
 # Always use pristine-tar.
 pristine-tar = True
+
+[buildpackage]
+pbuilder-options = --source-only-changes