diff --git a/Modules/FindFreetype.cmake b/Modules/FindFreetype.cmake
index 1f12ba654c..6f03c86b74 100644
--- a/Modules/FindFreetype.cmake
+++ b/Modules/FindFreetype.cmake
@@ -100,6 +100,7 @@ find_library(FREETYPE_LIBRARY
 # set the user variables
 if(FREETYPE_INCLUDE_DIR_ft2build AND FREETYPE_INCLUDE_DIR_freetype2)
   set(FREETYPE_INCLUDE_DIRS "${FREETYPE_INCLUDE_DIR_ft2build};${FREETYPE_INCLUDE_DIR_freetype2}")
+  list(REMOVE_DUPLICATES FREETYPE_INCLUDE_DIRS)
 endif()
 set(FREETYPE_LIBRARIES "${FREETYPE_LIBRARY}")