diff --git a/BUILD.gn b/BUILD.gn
index 27200cc..c25458a 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -250,7 +250,7 @@
   enabled = is_x86
   sources = skia_opts.avx_sources
   if (is_win) {
-    defines = [ "SK_CPU_SSE_LEVEL=SK_CPU_SSE_LEVEL_AVX" ]
+    cflags = [ "/arch:AVX" ]
   } else {
     cflags = [ "-mavx" ]
   }
@@ -260,7 +260,7 @@
   enabled = is_x86
   sources = skia_opts.hsw_sources
   if (is_win) {
-    defines = [ "SK_CPU_SSE_LEVEL=SK_CPU_SSE_LEVEL_AVX2" ]
+    cflags = [ "/arch:AVX2" ]
   } else {
     cflags = [
       "-mavx2",