diff --git a/monitor/fan_defs.hpp b/monitor/fan_defs.hpp
index 2cfd44a..b766f8e 100644
--- a/monitor/fan_defs.hpp
+++ b/monitor/fan_defs.hpp
@@ -4,3 +4,6 @@
 
 extern const std::vector<phosphor::fan::monitor::FanDefinition>
 fanDefinitions;
+
+extern const std::vector<phosphor::fan::monitor::CreateGroupFunction>
+trustGroups;