diff --git a/Modules/UseSWIG.cmake b/Modules/UseSWIG.cmake
index 269fa987ec..5c8f152bb7 100644
--- a/Modules/UseSWIG.cmake
+++ b/Modules/UseSWIG.cmake
@@ -530,7 +530,7 @@ function(SWIG_ADD_SOURCE_TO_MODULE name outfiles infile)
   endif()
   set (property "$<TARGET_PROPERTY:${target_name},SWIG_INCLUDE_DIRECTORIES>")
   list (APPEND swig_source_file_flags "$<$<BOOL:${property}>:-I$<JOIN:$<TARGET_GENEX_EVAL:${target_name},${property}>,$<SEMICOLON>-I>>")
-  set (property "$<TARGET_PROPERTY:${target_name},INCLUDE_DIRECTORIES>")
+  set (property "$<REMOVE_DUPLICATES:$<TARGET_PROPERTY:${target_name},INCLUDE_DIRECTORIES>>")
   get_source_file_property(use_target_include_dirs "${infile}" USE_TARGET_INCLUDE_DIRECTORIES)
   if (use_target_include_dirs)
     list (APPEND swig_source_file_flags "$<$<BOOL:${property}>:-I$<JOIN:${property},$<SEMICOLON>-I>>")