diff --git a/tools/crc.cpp b/tools/crc.cpp
index 4ed307b..e8083eb 100644
--- a/tools/crc.cpp
+++ b/tools/crc.cpp
@@ -1,5 +1,8 @@
 #include "crc.hpp"
 
+namespace host_tool
+{
+
 /*
  * This implementation tracks the specification given at
  * http://srecord.sourceforge.net/crc16-ccitt.html
@@ -37,3 +40,5 @@
 
     return crc;
 }
+
+} // namespace host_tool