--- build/rust/std/BUILD.gn.orig	2025-04-05 13:54:50 UTC
+++ build/rust/std/BUILD.gn
@@ -89,13 +89,20 @@ if (toolchain_has_rust) {
     # These are no longer present in the Windows toolchain.
     stdlib_files += [
       "addr2line",
-      "adler",
       "gimli",
       "libc",
       "memchr",
       "miniz_oxide",
       "object",
     ]
+
+    rust_revision_pieces = string_split(rustc_revision, " ")
+    rust_version_pieces = string_split(rust_revision_pieces[1], ".")
+    if (rust_version_pieces[1] == "85") {
+      stdlib_files += [ "adler" ]
+    } else {
+      stdlib_files += [ "adler2" ]
+    }
   }
 
   if (toolchain_for_rust_host_build_tools) {
@@ -115,7 +122,6 @@ if (toolchain_has_rust) {
   # don't need to pass to the C++ linker because they're used for specialized
   # purposes.
   skip_stdlib_files = [
-    "profiler_builtins",
     "rustc_std_workspace_alloc",
     "rustc_std_workspace_core",
     "rustc_std_workspace_std",