diff --git a/infrastructure-guide/test_systems.md b/infrastructure-guide/test_systems.md
index d53b37a7..ec68300c 100644
--- a/infrastructure-guide/test_systems.md
+++ b/infrastructure-guide/test_systems.md
@@ -23,7 +23,7 @@ The schema with all nodes of the test setup you find in the [Monitoring Environm
 
 ## Test RHEL Nodes
 
-This system are in the [`lxdev` sysdb environment](https://git.psi.ch/linux-infra/hiera/data-lxdev).
+This systems are in the [`lxdev` sysdb environment](https://git.psi.ch/linux-infra/hiera/data-lxdev).
 
 Here we have minimal configuration (`noconfig`) to test the default setup and a more extensive configuration (`muchconfig`) to have a test bed with more complex settings.