diff --git a/CMakeExternals/PatchITK-3.20.cmake b/CMakeExternals/PatchITK-3.20.cmake
index e0359a2c60..7dd459d922 100644
--- a/CMakeExternals/PatchITK-3.20.cmake
+++ b/CMakeExternals/PatchITK-3.20.cmake
@@ -1,25 +1,36 @@
 # Called by ITK.cmake (ExternalProject_Add) as a patch for ITK to work witk GDCM 2.0.18
 
 # First patch
 # updates library dependencies
 # read whole file CMakeLists.txt
 file(STRINGS CMakeLists.txt sourceCode NEWLINE_CONSUME)
 
 # substitute dependency to gdcmMSFF by dependencies for more libraries
 string(REGEX REPLACE "gdcmMSFF" "gdcmMSFF gdcmDICT gdcmCommon gdcmDSED" sourceCode ${sourceCode})
 
 # set variable CONTENTS, which is substituted in TEMPLATE_FILE
 set(CONTENTS ${sourceCode})
 configure_file(${TEMPLATE_FILE} CMakeLists.txt @ONLY)
 
 # second patch
 # read whole file
 file(STRINGS Code/Common/itkLandmarkBasedTransformInitializer.h sourceCode2 NEWLINE_CONSUME)
 
-# substitute dependency to gdcmMSFF by dependencies for more libraries
+# backported fix from ITK4
 string(REGEX REPLACE "typedef typename ParametersType::ValueType +ParameterValueType;" "typedef typename TransformType::ScalarType                      ParameterValueType;" sourceCode2 ${sourceCode2})
 
 # set variable CONTENTS, which is substituted in TEMPLATE_FILE
 set(CONTENTS ${sourceCode2})
 configure_file(${TEMPLATE_FILE} Code/Common/itkLandmarkBasedTransformInitializer.h @ONLY)
 
+# third patch
+# read whole file
+file(STRINGS Code/Common/itkImageSource.h sourceCode3 NEWLINE_CONSUME)
+
+# remove ITK_NO_RETURN since the method sometimes returns which makes clang based builds crash
+string(REGEX REPLACE "ITK_NO_RETURN" "" sourceCode3 ${sourceCode3})
+
+# set variable CONTENTS, which is substituted in TEMPLATE_FILE
+set(CONTENTS ${sourceCode3})
+configure_file(${TEMPLATE_FILE} Code/Common/itkImageSource.h @ONLY)
+