diff --git a/config/examples/sim-delta-update.config b/config/examples/sim-delta-update.config
index 8992b91c5..2cba7a249 100644
--- a/config/examples/sim-delta-update.config
+++ b/config/examples/sim-delta-update.config
@@ -6,6 +6,7 @@ WOLFBOOT_SMALL_STACK=1
 SPI_FLASH=0
 DEBUG=1
 DELTA_UPDATES=1
+IMAGE_HEADER_SIZE=512
 
 # sizes should be multiple of system page size
 WOLFBOOT_PARTITION_SIZE=0x40000