diff --git a/src/third_party/brotli/BUILD.gn b/src/third_party/brotli/BUILD.gn
index 0aa74779e8..4395670868 100644
--- a/src/third_party/brotli/BUILD.gn
+++ b/src/third_party/brotli/BUILD.gn
@@ -9,9 +9,9 @@ if (is_win) {
 config("brotli_defines") {
   # By default, brotli depends on undefined behavior, but setting
   # BROTLI_BUILD_PORTABLE should result in a build which does not.
-  if (is_ubsan) {
-    defines = [ "BROTLI_BUILD_PORTABLE" ]
-  }
+  #if (is_ubsan) {
+  #  defines = [ "BROTLI_BUILD_PORTABLE" ]
+  #}
 }
 
 config("includes") {