diff --git a/host_check.hpp b/host_check.hpp
index 0634f61..1a64912 100644
--- a/host_check.hpp
+++ b/host_check.hpp
@@ -1,7 +1,18 @@
 #pragma once
 
+namespace phosphor
+{
+namespace state
+{
+namespace manager
+{
+
 /** @brief Determine if host is running
  *
  * @return True if host running, False otherwise
  */
 bool isHostRunning();
+
+} // namespace manager
+} // namespace state
+} // namespace phosphor