diff --git a/boot/zephyr/CMakeLists.txt b/boot/zephyr/CMakeLists.txt
index 1c334c1..f559844 100644
--- a/boot/zephyr/CMakeLists.txt
+++ b/boot/zephyr/CMakeLists.txt
@@ -6,6 +6,19 @@
 
 cmake_minimum_required(VERSION 3.13.1)
 
+# Add a common dts overlay necessary to ensure mcuboot is linked into,
+# and fits inside, the boot partition. (If the user specified a
+# DTC_OVERLAY_FILE on the CMake command line, we need to append onto
+# the list).
+if(DTC_OVERLAY_FILE)
+  set(DTC_OVERLAY_FILE
+    "${DTC_OVERLAY_FILE} ${CMAKE_CURRENT_LIST_DIR}/dts.overlay"
+    CACHE STRING "" FORCE
+    )
+else()
+  set(DTC_OVERLAY_FILE ${CMAKE_CURRENT_LIST_DIR}/dts.overlay)
+endif()
+
 # Enable Zephyr runner options which request mass erase if so
 # configured.
 #
diff --git a/boot/zephyr/dts.overlay b/boot/zephyr/dts.overlay
new file mode 100644
index 0000000..74d3dfb
--- /dev/null
+++ b/boot/zephyr/dts.overlay
@@ -0,0 +1,5 @@
+/ {
+	chosen {
+		zephyr,code-partition = &boot_partition;
+	};
+};