diff --git a/apt-repositories/tests/spec/main_spec.rb b/apt-repositories/tests/spec/main_spec.rb
index 0c8d9ace..ff40dab9 100644
--- a/apt-repositories/tests/spec/main_spec.rb
+++ b/apt-repositories/tests/spec/main_spec.rb
@@ -13,9 +13,11 @@ describe file("/etc/apt/preferences.d/0-backports-defaults") do
 end
 
 describe command("grep 'main contrib non-free' /etc/apt/sources.list.d/backports.list") do
+  its(:stdout) { should_not be_empty }
   its(:exit_status) { should eq 0 }
 end
 
 describe command("grep 'main contrib non-free' /etc/apt/sources.list") do
+  its(:stdout) { should_not be_empty }
   its(:exit_status) { should eq 0 }
 end