diff --git a/openssl-sys/build/main.rs b/openssl-sys/build/main.rs
index 50ecc0f08..80b81371f 100644
--- a/openssl-sys/build/main.rs
+++ b/openssl-sys/build/main.rs
@@ -74,7 +74,7 @@ fn check_ssl_kind() {
 }
 
 fn main() {
-    println!("cargo:rustc-check-cfg=cfg(osslconf, values(\"OPENSSL_NO_OCB\", \"OPENSSL_NO_SM4\", \"OPENSSL_NO_SEED\", \"OPENSSL_NO_CHACHA\", \"OPENSSL_NO_CAST\", \"OPENSSL_NO_IDEA\", \"OPENSSL_NO_CAMELLIA\", \"OPENSSL_NO_RC4\", \"OPENSSL_NO_BF\", \"OPENSSL_NO_PSK\", \"OPENSSL_NO_DEPRECATED_3_0\", \"OPENSSL_NO_SCRYPT\", \"OPENSSL_NO_SM3\", \"OPENSSL_NO_RMD160\", \"OPENSSL_NO_EC2M\", \"OPENSSL_NO_OCSP\", \"OPENSSL_NO_CMS\", \"OPENSSL_NO_COMP\", \"OPENSSL_NO_SOCK\", \"OPENSSL_NO_STDIO\", \"OPENSSL_NO_EC\", \"OPENSSL_NO_SSL3_METHOD\", \"OPENSSL_NO_KRB5\", \"OPENSSL_NO_TLSEXT\", \"OPENSSL_NO_SRP\", \"OPENSSL_NO_RFC3779\", \"OPENSSL_NO_SHA\", \"OPENSSL_NO_NEXTPROTONEG\", \"OPENSSL_NO_ENGINE\", \"OPENSSL_NO_BUF_FREELISTS\"))");
+    println!("cargo:rustc-check-cfg=cfg(osslconf, values(\"OPENSSL_NO_THREAD_POOL\", \"OPENSSL_NO_OCB\", \"OPENSSL_NO_SM4\", \"OPENSSL_NO_SEED\", \"OPENSSL_NO_CHACHA\", \"OPENSSL_NO_CAST\", \"OPENSSL_NO_IDEA\", \"OPENSSL_NO_CAMELLIA\", \"OPENSSL_NO_RC4\", \"OPENSSL_NO_BF\", \"OPENSSL_NO_PSK\", \"OPENSSL_NO_DEPRECATED_3_0\", \"OPENSSL_NO_SCRYPT\", \"OPENSSL_NO_SM3\", \"OPENSSL_NO_RMD160\", \"OPENSSL_NO_EC2M\", \"OPENSSL_NO_OCSP\", \"OPENSSL_NO_CMS\", \"OPENSSL_NO_COMP\", \"OPENSSL_NO_SOCK\", \"OPENSSL_NO_STDIO\", \"OPENSSL_NO_EC\", \"OPENSSL_NO_SSL3_METHOD\", \"OPENSSL_NO_KRB5\", \"OPENSSL_NO_TLSEXT\", \"OPENSSL_NO_SRP\", \"OPENSSL_NO_RFC3779\", \"OPENSSL_NO_SHA\", \"OPENSSL_NO_NEXTPROTONEG\", \"OPENSSL_NO_ENGINE\", \"OPENSSL_NO_BUF_FREELISTS\"))");
 
     println!("cargo:rustc-check-cfg=cfg(openssl)");
     println!("cargo:rustc-check-cfg=cfg(libressl)");
diff --git a/openssl-sys/build/run_bindgen.rs b/openssl-sys/build/run_bindgen.rs
index ffaecdc81..313fee735 100644
--- a/openssl-sys/build/run_bindgen.rs
+++ b/openssl-sys/build/run_bindgen.rs
@@ -63,6 +63,10 @@ const INCLUDES: &str = "
 #if defined(LIBRESSL_VERSION_NUMBER) || defined(OPENSSL_IS_BORINGSSL)
 #include <openssl/poly1305.h>
 #endif
+
+#if OPENSSL_VERSION_NUMBER >= 0x30000000 && !defined(OPENSSL_NO_THREAD_POOL)
+#include <openssl/thread.h>
+#endif
 ";
 
 #[cfg(feature = "bindgen")]
diff --git a/openssl-sys/src/handwritten/mod.rs b/openssl-sys/src/handwritten/mod.rs
index f54ec9be5..43c8e5171 100644
--- a/openssl-sys/src/handwritten/mod.rs
+++ b/openssl-sys/src/handwritten/mod.rs
@@ -29,6 +29,8 @@ pub use self::sha::*;
 pub use self::srtp::*;
 pub use self::ssl::*;
 pub use self::stack::*;
+#[cfg(all(ossl300, not(osslconf = "OPENSSL_NO_THREAD_POOL")))]
+pub use self::thread::*;
 pub use self::tls1::*;
 pub use self::types::*;
 pub use self::x509::*;
@@ -66,6 +68,8 @@ mod sha;
 mod srtp;
 mod ssl;
 mod stack;
+#[cfg(all(ossl300, not(osslconf = "OPENSSL_NO_THREAD_POOL")))]
+mod thread;
 mod tls1;
 mod types;
 mod x509;
diff --git a/openssl-sys/src/handwritten/thread.rs b/openssl-sys/src/handwritten/thread.rs
new file mode 100644
index 000000000..de661e1c5
--- /dev/null
+++ b/openssl-sys/src/handwritten/thread.rs
@@ -0,0 +1,7 @@
+use super::super::*;
+use libc::*;
+
+extern "C" {
+    pub fn OSSL_set_max_threads(ctx: *mut OSSL_LIB_CTX, max_threads: u64) -> c_int;
+    pub fn OSSL_get_max_threads(ctx: *mut OSSL_LIB_CTX) -> u64;
+}
diff --git a/systest/build.rs b/systest/build.rs
index 56230ada6..019a522de 100644
--- a/systest/build.rs
+++ b/systest/build.rs
@@ -84,6 +84,8 @@ fn main() {
 
         if version >= 0x30000000 {
             cfg.header("openssl/provider.h");
+            // thread is present as a header even if OPENSSL_NO_THREAD_POOL is defined
+            cfg.header("openssl/thread.h");
         }
     }