diff --git a/sim/mcuboot-sys/csupport/run.c b/sim/mcuboot-sys/csupport/run.c
index c8bfd4e..201b50b 100644
--- a/sim/mcuboot-sys/csupport/run.c
+++ b/sim/mcuboot-sys/csupport/run.c
@@ -422,6 +422,12 @@
     abort();
 }
 
+uint8_t flash_area_get_device_id(const struct flash_area *fa)
+{
+	(void)fa;
+	return 0;
+}
+
 void sim_assert(int x, const char *assertion, const char *file, unsigned int line, const char *function)
 {
     if (!(x)) {