diff --git a/CMakeExternals/PatchGDCM-20130814.cmake b/CMakeExternals/PatchGDCM-20130814.cmake
index b816d003fd..437e1c6663 100644
--- a/CMakeExternals/PatchGDCM-20130814.cmake
+++ b/CMakeExternals/PatchGDCM-20130814.cmake
@@ -1,12 +1,12 @@
 # Called by GDCM.cmake (ExternalProject_Add) as a patch for GDCM.
 # Related bug: http://bugs.mitk.org/show_bug.cgi?id=15800
 
 # read whole file
 file(STRINGS Source/MediaStorageAndFileFormat/gdcmSorter.cxx sourceCode NEWLINE_CONSUME)
 
 # Changing the way gdcmSorter.cxx behaves when encountering an unreadable file
-string(REGEX REPLACE "f = NULL;" "std::cerr << "Err: File could not be read: " << it->c_str() << std::endl;\n return false;" sourceCode ${sourceCode})
+string(REPLACE "f = NULL;" "std::cerr << \"Err: File could not be read: \" << it->c_str() << std::endl; \n      return false;" sourceCode ${sourceCode})
 
 # set variable CONTENTS, which is substituted in TEMPLATE_FILE
 set(CONTENTS ${sourceCode})
 configure_file(${TEMPLATE_FILE} Source/MediaStorageAndFileFormat/gdcmSorter.cxx @ONLY)