diff --git a/mitkTestingConfig.h.in b/mitkTestingConfig.h.in
index 02b0b416ec..cc93ab0c19 100644
--- a/mitkTestingConfig.h.in
+++ b/mitkTestingConfig.h.in
@@ -1,13 +1,19 @@
 /*
   mitkTestingConfig.h
   this file is generated. Do not change!
 */
+#ifndef MITKTESTINGCONFIG_H
+#define MITKTESTINGCONFIG_H
+
 #cmakedefine BUILD_TESTING
 #cmakedefine MITK_FAST_TESTING
 #define MITK_TEST_OUTPUT_DIR "@MITK_TEST_OUTPUT_DIR@"
 
 #ifdef CMAKE_INTDIR
-#define MITK_RUNTIME_OUTPUT_DIR "@CMAKE_RUNTIME_OUTPUT_DIRECTORY@/" ## CMAKE_INTDIR
+#include <mitkPPStringize.h>
+#define MITK_RUNTIME_OUTPUT_DIR "@CMAKE_RUNTIME_OUTPUT_DIRECTORY@/" MITK_PP_STRINGIZE(CMAKE_INTDIR)
 #else
 #define MITK_RUNTIME_OUTPUT_DIR "@CMAKE_RUNTIME_OUTPUT_DIRECTORY@"
 #endif
+
+#endif // MITKTESTINGCONFIG_H