diff --git a/writefru.mako.hpp b/writefru.mako.hpp
index 786edbd..f7f06c5 100755
--- a/writefru.mako.hpp
+++ b/writefru.mako.hpp
@@ -28,7 +28,9 @@
  *  @param [in] path - FRU object path
  */
 template<Fru F>
-void writeFru(const Store& vpdStore, const std::string& path);
+void writeFru(const Store& vpdStore, const std::string& path) {
+    throw std::runtime_error("Not implemented");
+}
 
 % for key in fruDict.iterkeys():
 <%