diff --git a/sys/conf/dtb.build.mk b/sys/conf/dtb.build.mk
index 33a6413e0521..140440336cad 100644
--- a/sys/conf/dtb.build.mk
+++ b/sys/conf/dtb.build.mk
@@ -24,7 +24,16 @@ SYSDIR=	${_dir:tA}
 .error "can't find kernel source tree"
 .endif
 
-DTB=${DTS:T:R:S/$/.dtb/}
+.for _dts in ${DTS}
+# DTB for aarch64 needs to preserve the immediate parent of the .dts, because
+# these DTS are vendored and should be installed into their vendored directory.
+.if ${MACHINE_ARCH} == "aarch64"
+DTB+=	${_dts:R:S/$/.dtb/}
+.else
+DTB+=	${_dts:T:R:S/$/.dtb/}
+.endif
+.endfor
+
 DTBO=${DTSO:T:R:S/$/.dtbo/}
 
 .SUFFIXES: .dtb .dts .dtbo .dtso