diff --git a/bazel/cc_toolchains/cc_toolchain_cpp_features.bzl b/bazel/cc_toolchains/cc_toolchain_cpp_features.bzl
index 29c1105ed4c1..44a243f4cb5e 100644
--- a/bazel/cc_toolchains/cc_toolchain_cpp_features.bzl
+++ b/bazel/cc_toolchains/cc_toolchain_cpp_features.bzl
@@ -67,6 +67,7 @@ clang_feature = feature(
             actions = ACTION_NAME_GROUPS.all_cpp_compile_actions,
             flag_groups = [flag_group(flags = [
                 "-fno-exceptions",
+                "-fno-rtti",
                 "-std=c++20",
             ])],
         ),
diff --git a/toolchain/install/BUILD b/toolchain/install/BUILD
index 0e418c994adf..5d445c0ae72f 100644
--- a/toolchain/install/BUILD
+++ b/toolchain/install/BUILD
@@ -574,6 +574,9 @@ cc_library(
         # than the client (our toolchain) uses, even though they both include
         # the same headers from the libraries.
         "-fexceptions",
+        # Like exceptions, these libraries are built internally with RTTI
+        # enabled, while the toolchain is built without.
+        "-frtti",
     ],
     hdrs_check = "strict",
     includes = [