diff --git a/Modules/ThirdParty/KWSys/src/CMakeLists.txt b/Modules/ThirdParty/KWSys/src/CMakeLists.txt
index 3c806d816d..6096ec57df 100644
--- a/Modules/ThirdParty/KWSys/src/CMakeLists.txt
+++ b/Modules/ThirdParty/KWSys/src/CMakeLists.txt
@@ -24,7 +24,9 @@ set(KWSYS_INSTALL_COMPONENT_NAME_DEVELOPMENT Development)
 set(KWSYS_PROPERTIES_C WINDOWS_EXPORT_ALL_SYMBOLS FALSE)
 set( _macosx_rpath 1)
 if(DEFINED CMAKE_MACOSX_RPATH AND NOT "${CMAKE_MACOSX_RPATH}" STREQUAL "")
-  set(_macosx_rpath ${CMAKE_MACOSX_RPATH})
+  if (NOT CMAKE_MACOSX_RPATH)
+    set(_macosx_rpath 0)
+  endif()
 endif()
 set(KWSYS_PROPERTIES_CXX MACOSX_RPATH ${_macosx_rpath} WINDOWS_EXPORT_ALL_SYMBOLS FALSE)