diff --git a/package/uboot-tools/uboot-tools.mk b/package/uboot-tools/uboot-tools.mk
index d7a631fdc8..2966ccf6d0 100644
--- a/package/uboot-tools/uboot-tools.mk
+++ b/package/uboot-tools/uboot-tools.mk
@@ -28,7 +28,7 @@ UBOOT_TOOLS_DEPENDENCIES += dtc
 endif
 
 ifeq ($(BR2_PACKAGE_UBOOT_TOOLS_FIT_SIGNATURE_SUPPORT),y)
-UBOOT_TOOLS_MAKE_OPTS += CONFIG_FIT_SIGNATURE=y
+UBOOT_TOOLS_MAKE_OPTS += CONFIG_FIT_SIGNATURE=y CONFIG_FIT_SIGNATURE_MAX_SIZE=0x10000000
 UBOOT_TOOLS_DEPENDENCIES += openssl host-pkgconf
 endif
 
@@ -91,7 +91,7 @@ HOST_UBOOT_TOOLS_DEPENDENCIES += host-dtc
 endif
 
 ifeq ($(BR2_PACKAGE_HOST_UBOOT_TOOLS_FIT_SIGNATURE_SUPPORT),y)
-HOST_UBOOT_TOOLS_MAKE_OPTS += CONFIG_FIT_SIGNATURE=y
+HOST_UBOOT_TOOLS_MAKE_OPTS += CONFIG_FIT_SIGNATURE=y CONFIG_FIT_SIGNATURE_MAX_SIZE=0x10000000
 HOST_UBOOT_TOOLS_DEPENDENCIES += host-openssl
 endif