diff --git a/debian/rules b/debian/rules
index 75b70a0..a21b9b3 100755
--- a/debian/rules
+++ b/debian/rules
@@ -14,6 +14,11 @@
 %:
 	dh $@ --buildsystem=ruby --with ruby
 
+override_dh_auto_install:
+	# Tests are run during installation and compare locale-sensitive
+	# strings.
+	LC_ALL=C dh_auto_install
+
 manpage: debian/homesick.1
 	@true