diff --git a/cmake/dts.cmake b/cmake/dts.cmake
index ab16f92fea7..e0ab9ad5711 100644
--- a/cmake/dts.cmake
+++ b/cmake/dts.cmake
@@ -33,6 +33,8 @@ list(APPEND
   ${ZEPHYR_BASE}
   )
 
+list(REMOVE_DUPLICATES DTS_ROOT)
+
 set(dts_files
   ${DTS_SOURCE}
   ${shield_dts_files}