diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6795b67967..4136901f6c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2073,6 +2073,8 @@ if(HAVE_MANUAL_TOOLS)
   add_subdirectory(docs)
 endif()
 
+list(REMOVE_DUPLICATES CURL_LIBDIRS)
+
 add_subdirectory(lib)
 
 if(BUILD_CURL_EXE)