diff --git a/configs/sifive_fu540_defconfig b/configs/sifive_fu540_defconfig
index 5f6d1c7..790da97 100644
--- a/configs/sifive_fu540_defconfig
+++ b/configs/sifive_fu540_defconfig
@@ -1,4 +1,5 @@
 CONFIG_RISCV=y
+CONFIG_ENV_SIZE=0x20000
 CONFIG_NR_DRAM_BANKS=1
 CONFIG_TARGET_SIFIVE_FU540=y
 CONFIG_ARCH_RV64I=y