diff --git a/buildtools/third_party/libc++abi/BUILD.gn b/buildtools/third_party/libc++abi/BUILD.gn
index 91839cc154512..40f1285f14c08 100644
--- a/buildtools/third_party/libc++abi/BUILD.gn
+++ b/buildtools/third_party/libc++abi/BUILD.gn
@@ -59,7 +59,6 @@ source_set("libc++abi") {
 
   defines = [
     "LIBCXXABI_SILENT_TERMINATE",
-    "_LIBCPP_ENABLE_CXX17_REMOVED_UNEXPECTED_FUNCTIONS",
 
     # TODO(crbug.com/1298070) _LIBCPP_CONSTINIT is defined in a libc++ revision
     # more recent than the one currently used in Chromium.