diff --git a/lib/clang/libllvm/Makefile b/lib/clang/libllvm/Makefile
--- a/lib/clang/libllvm/Makefile
+++ b/lib/clang/libllvm/Makefile
@@ -31,6 +31,9 @@
 CFLAGS+=	-DBLAKE3_NO_AVX512 -DBLAKE3_NO_AVX2 -DBLAKE3_NO_SSE41 \
 		-DBLAKE3_NO_SSE2
 .endif
+.if ${TARGET_ARCH} != "arm64"
+CFLAGS+=	-DBLAKE3_USE_NEON=0
+.endif
 
 SRCDIR=		llvm/lib