diff --git a/conf/machine/imx7d-pico.conf b/conf/machine/imx7d-pico.conf
index 5e67a7f..4e67e78 100644
--- a/conf/machine/imx7d-pico.conf
+++ b/conf/machine/imx7d-pico.conf
@@ -22,6 +22,7 @@ KERNEL_DEVICETREE = " \
 
 SPL_BINARY = "SPL"
 UBOOT_BINARY = "u-boot-dtb.img"
+UBOOT_SUFFIX = "img"
 UBOOT_MAKE_TARGET = ""
 
 UBOOT_CONFIG ??= "dwarf hobbit nymph pi generic"
diff --git a/conf/machine/imx7s-warp.conf b/conf/machine/imx7s-warp.conf
index f76386b..59398ec 100644
--- a/conf/machine/imx7s-warp.conf
+++ b/conf/machine/imx7s-warp.conf
@@ -16,6 +16,7 @@ MACHINE_FEATURES += " wifi bluetooth"
 KERNEL_DEVICETREE = "imx7s-warp.dtb"
 
 UBOOT_BINARY = "u-boot-dtb.imx"
+UBOOT_SUFFIX = "imx"
 UBOOT_MAKE_TARGET = ""
 
 UBOOT_CONFIG ??= "sd"