diff --git a/Modules/Classification/CLUtilities/include/mitkSplitParameterToVector.h b/Modules/Classification/CLUtilities/include/mitkSplitParameterToVector.h
index 25abcb7586..a8903539ae 100644
--- a/Modules/Classification/CLUtilities/include/mitkSplitParameterToVector.h
+++ b/Modules/Classification/CLUtilities/include/mitkSplitParameterToVector.h
@@ -1,34 +1,35 @@
 /*===================================================================
 
 The Medical Imaging Interaction Toolkit (MITK)
 
 Copyright (c) German Cancer Research Center,
 Division of Medical and Biological Informatics.
 All rights reserved.
 
 This software is distributed WITHOUT ANY WARRANTY; without
 even the implied warranty of MERCHANTABILITY or FITNESS FOR
 A PARTICULAR PURPOSE.
 
 See LICENSE.txt or http://www.mitk.org for details.
 
 ===================================================================*/
 
 #ifndef mitkSplitParameterToVector_h
 #define mitkSplitParameterToVector_h
 
+#include "MitkCLUtilitiesExports.h"
 #include <string>
 #include <vector>
 
 namespace mitk
 {
   namespace cl
   {
-    std::vector<double> splitDouble(std::string str, char delimiter);
-    std::vector<int> splitInt(std::string str, char delimiter);
-    std::vector<std::string> splitString(std::string str, char delimiter);
+    std::vector<double> MITKCLUTILITIES_EXPORT splitDouble(std::string str, char delimiter);
+    std::vector<int> MITKCLUTILITIES_EXPORT splitInt(std::string str, char delimiter);
+    std::vector<std::string> MITKCLUTILITIES_EXPORT splitString(std::string str, char delimiter);
   }
 }
 
 
 #endif //mitkSplitParameterToVector_h
\ No newline at end of file