diff --git a/rust/CMakeLists.txt b/rust/CMakeLists.txt
index 344d80f..019976b 100644
--- a/rust/CMakeLists.txt
+++ b/rust/CMakeLists.txt
@@ -12,23 +12,8 @@
             --size_t-is-usize
             --default-macro-constant-type="signed"
             --rustified-enum="point_conversion_form_t"
-            # These are not BoringSSL symbols, they are from glibc
-            # and are not relevant to the build besides throwing warnings
-            # about their 'long double' (aka u128) not being FFI safe.
-            # We block those functions so that the build doesn't
-            # spam warnings.
-            #
-            # https://github.com/rust-lang/rust-bindgen/issues/1549 describes the current problem
-            # and other folks' solutions.
-            #
-            # We will explore migrating to https://github.com/rust-lang/rust-bindgen/pull/2122
-            # when it lands
-            --blocklist-function="strtold"
-            --blocklist-function="qecvt"
-            --blocklist-function="qecvt_r"
-            --blocklist-function="qgcvt"
-            --blocklist-function="qfcvt"
-            --blocklist-function="qfcvt_r"
+            --allowlist-file=".*/include/openssl/.*\\.h"
+            --allowlist-file=".*/rust_wrapper\\.h"
             -- # these are LLVM arg passthroughs
             -I../include
             # https://doc.rust-lang.org/nightly/rustc/platform-support.html