Index: head/sys/modules/dtrace/Makefile
===================================================================
--- head/sys/modules/dtrace/Makefile
+++ head/sys/modules/dtrace/Makefile
@@ -23,6 +23,7 @@
 SUBDIR+=	fbt fasttrap
 .endif
 .if ${MACHINE_CPUARCH} == "amd64" || \
+    ${MACHINE_CPUARCH} == "aarch64" || \
     ${MACHINE_ARCH} == "mips64" || \
     ${MACHINE_ARCH} == "powerpc64"
 SUBDIR+=	systrace_freebsd32