diff --git a/lib/TTLS/include/Credentials.h b/lib/TTLS/include/Credentials.h
index 732564f..c37ae67 100644
--- a/lib/TTLS/include/Credentials.h
+++ b/lib/TTLS/include/Credentials.h
@@ -176,6 +176,11 @@ namespace eap
         ///
         virtual bool retrieve(_In_ LPCTSTR pszTargetName, _Out_ EAP_ERROR **ppEapError);
 
+        ///
+        /// Return target suffix for Windows Credential Manager credential name
+        ///
+        virtual LPCTSTR target_suffix() const;
+
         ///
         /// Returns credential identity.
         ///
diff --git a/lib/TTLS/src/Credentials.cpp b/lib/TTLS/src/Credentials.cpp
index 5428d60..78f7601 100644
--- a/lib/TTLS/src/Credentials.cpp
+++ b/lib/TTLS/src/Credentials.cpp
@@ -232,6 +232,13 @@ bool eap::credentials_ttls::retrieve(_In_ LPCTSTR pszTargetName, _Out_ EAP_ERROR
 }
 
 
+LPCTSTR eap::credentials_ttls::target_suffix() const
+{
+    assert(0); // Not that we would ever store inner&outer credentials to Windows Credential Manager joined, but for completness sake... Here we go:
+    return _T("TTLS");
+}
+
+
 std::wstring eap::credentials_ttls::get_identity() const
 {
     // Outer identity has the right-of-way.