diff --git a/Code/Mantid/Framework/ICat/inc/MantidICat/ICat3/ICat3Catalog.h b/Code/Mantid/Framework/ICat/inc/MantidICat/ICat3/ICat3Catalog.h
index e678f93d47d3..cdd68e7cc2ac 100644
--- a/Code/Mantid/Framework/ICat/inc/MantidICat/ICat3/ICat3Catalog.h
+++ b/Code/Mantid/Framework/ICat/inc/MantidICat/ICat3/ICat3Catalog.h
@@ -73,7 +73,7 @@ namespace Mantid
       virtual const std::string getUploadURL(
           const std::string &investigationID, const std::string &createFileName, const std::string &dataFileDescription);
       /// Generate a DOI for a datafile based on the related investigation.
-      virtual const std::string registerDatafileDOI(const long long& investigationID);
+      virtual const std::string registerDatafileDOI(const long long& databaseID);
 
     private:
       /// The helper class that accesses ICAT functionality.
diff --git a/Code/Mantid/Framework/ICat/inc/MantidICat/ICat4/ICat4Catalog.h b/Code/Mantid/Framework/ICat/inc/MantidICat/ICat4/ICat4Catalog.h
index 406a4eb4405e..ad5595e91c7e 100644
--- a/Code/Mantid/Framework/ICat/inc/MantidICat/ICat4/ICat4Catalog.h
+++ b/Code/Mantid/Framework/ICat/inc/MantidICat/ICat4/ICat4Catalog.h
@@ -70,7 +70,7 @@ namespace Mantid
         virtual const std::string getUploadURL(
             const std::string &investigationID, const std::string &createFileName, const std::string &dataFileDescription);
         /// Generate a DOI for a datafile based on the related investigation.
-        virtual const std::string registerDatafileDOI(const long long& investigationID);
+        virtual const std::string registerDatafileDOI(const long long& databaseID);
 
       private:
         // Ensures human friendly error messages are provided to the user.
diff --git a/Code/Mantid/Framework/ICat/src/ICat3/ICat3Catalog.cpp b/Code/Mantid/Framework/ICat/src/ICat3/ICat3Catalog.cpp
index eec36e8611ff..f086da42a181 100644
--- a/Code/Mantid/Framework/ICat/src/ICat3/ICat3Catalog.cpp
+++ b/Code/Mantid/Framework/ICat/src/ICat3/ICat3Catalog.cpp
@@ -119,12 +119,12 @@ namespace Mantid
 
     /**
      * Generate a DOI for a datafile based on the related investigation.
-     * @param investigationID :: The investigation of the datafile to register the DOI for.
+     * @param databaseID :: The database ID of the datafile's investigation to register the DOI for.
      * @return The DOI that was generated for the datafile.
      */
-    const std::string ICat3Catalog::registerDatafileDOI(const long long& investigationID)
+    const std::string ICat3Catalog::registerDatafileDOI(const long long& databaseID)
     {
-      UNUSED_ARG(investigationID);
+      UNUSED_ARG(databaseID);
       throw std::runtime_error("ICat3Catalog does not support registrations of DOIs.");
     }
 
diff --git a/Code/Mantid/Framework/ICat/src/ICat4/ICat4Catalog.cpp b/Code/Mantid/Framework/ICat/src/ICat4/ICat4Catalog.cpp
index c773f2fb2fcb..a91d36f04ff2 100644
--- a/Code/Mantid/Framework/ICat/src/ICat4/ICat4Catalog.cpp
+++ b/Code/Mantid/Framework/ICat/src/ICat4/ICat4Catalog.cpp
@@ -779,13 +779,11 @@ namespace Mantid
 
     /**
      * Generate a DOI for a datafile based on the related investigation.
-     * @param investigationID :: The investigation of the datafile to register the DOI for.
+     * @param databaseID :: The database ID of the datafile's investigation to register the DOI for.
      * @return The DOI that was generated for the datafile.
      */
-    const std::string ICat4Catalog::registerDatafileDOI(const long long& investigationID)
+    const std::string ICat4Catalog::registerDatafileDOI(const long long& databaseID)
     {
-      UNUSED_ARG(investigationID);
-      return "";
     }
 
     /**