diff --git a/boot/zephyr/CMakeLists.txt b/boot/zephyr/CMakeLists.txt
index 8c623be..d9f8883 100644
--- a/boot/zephyr/CMakeLists.txt
+++ b/boot/zephyr/CMakeLists.txt
@@ -118,7 +118,7 @@
 
 # This is necessary to ensure mcuboot is linked into, and fits inside,
 # the boot partition.
-set(DTC_OVERLAY_FILE dts.overlay)
+set(DTC_OVERLAY_FILE ${CMAKE_CURRENT_LIST_DIR}/dts.overlay)
 
 # Standard Zephyr application boilerplate:
 # http://docs.zephyrproject.org/application/application.html