diff --git a/meta-nuvoton/conf/machine/include/npcm8xx.inc b/meta-nuvoton/conf/machine/include/npcm8xx.inc
index 1605363..24956a2 100644
--- a/meta-nuvoton/conf/machine/include/npcm8xx.inc
+++ b/meta-nuvoton/conf/machine/include/npcm8xx.inc
@@ -43,6 +43,7 @@
 
 COMPATIBLE_MACHINE:npcm8xx = "npcm8xx"
 TFA_PLATFORM = "npcm845x"
+PREFERRED_VERSION_trusted-firmware-a ?= "2.9.%"
 
 # Nuvoton prefers optee for BL32.
 TFA_SPD = "opteed"