diff --git a/src/ca-module.cpp b/src/ca-module.cpp
index 4d055e3..322bbb5 100644
--- a/src/ca-module.cpp
+++ b/src/ca-module.cpp
@@ -186,7 +186,7 @@
 
   // process PROBE requests: collect probe parameters
   auto parameters = PROBE::decodeApplicationParameters(request.getApplicationParameters());
-  std::vector<std::string> availableComponents;
+  std::vector<PartialName> availableComponents;
   if (m_config.m_nameAssignmentFunc) {
     try {
       availableComponents = m_config.m_nameAssignmentFunc(parameters);
diff --git a/src/configuration.hpp b/src/configuration.hpp
index acd1b99..3d9ef9a 100644
--- a/src/configuration.hpp
+++ b/src/configuration.hpp
@@ -87,7 +87,7 @@
  * @p vector, input, a list of parameter key-value pair used for name assignment.
  * @return a vector containing the possible namespaces derived from the parameters.
  */
-using NameAssignmentFunc = function<std::vector<std::string>(const std::vector<std::tuple<std::string, std::string>>)>;
+using NameAssignmentFunc = function<std::vector<PartialName>(const std::vector<std::tuple<std::string, std::string>>)>;
 
 /**
  * @brief The function would be invoked whenever the certificate request status is updated.