Index: src/SSLSocket.m
==================================================================
--- src/SSLSocket.m
+++ src/SSLSocket.m
@@ -24,19 +24,16 @@
 
 #include <unistd.h>
 #include <errno.h>
 #include <assert.h>
 
-#import <ObjFW/OFHTTPRequest.h>
-#import <ObjFW/OFDataArray.h>
-
 #include <openssl/crypto.h>
 #include <openssl/err.h>
 
-#import "SSLSocket.h"
-#import "SSLInvalidCertificateException.h"
-#import "X509Certificate.h"
+#import <ObjFW/OFThread.h>
+#import <ObjFW/OFHTTPRequest.h>
+#import <ObjFW/OFDataArray.h>
 
 #import <ObjFW/OFAcceptFailedException.h>
 #import <ObjFW/OFConnectionFailedException.h>
 #import <ObjFW/OFInitializationFailedException.h>
 #import <ObjFW/OFInvalidArgumentException.h>
@@ -45,19 +42,29 @@
 #import <ObjFW/OFReadFailedException.h>
 #import <ObjFW/OFWriteFailedException.h>
 #import <ObjFW/macros.h>
 #import <ObjFW/threading.h>
 
+#import "SSLSocket.h"
+#import "SSLInvalidCertificateException.h"
+#import "X509Certificate.h"
+
 #ifndef INVALID_SOCKET
 # define INVALID_SOCKET -1
 #endif
 
 static SSL_CTX *ctx;
 static of_mutex_t *ssl_mutexes;
+
+static unsigned long
+get_thread_id(void)
+{
+	return (unsigned long)(uintptr_t)[OFThread currentThread];
+}
 
 static void
-ssl_locking_callback(int mode, int n, const char *file, int line)
+locking_callback(int mode, int n, const char *file, int line)
 {
 	/*
 	 * This function must handle up to CRYPTO_num_locks() mutexes.
 	 * It must set the n-th lock if mode & CRYPTO_LOCK,
 	 * release it otherwise.
@@ -79,19 +86,19 @@
 	int m;
 
 	if (self != [SSLSocket class])
 		return;
 
-	CRYPTO_set_id_callback(&of_thread_current);
+	CRYPTO_set_id_callback(&get_thread_id);
 
 	/* Generate number of mutexes needed */
 	m = CRYPTO_num_locks();
 	ssl_mutexes = malloc(m * sizeof(of_mutex_t));
 	for (m--; m >= 0; m--)
 		of_mutex_new(&ssl_mutexes[m]);
 
-	CRYPTO_set_locking_callback(&ssl_locking_callback);
+	CRYPTO_set_locking_callback(&locking_callback);
 
 	SSL_library_init();
 
 	if ((ctx = SSL_CTX_new(SSLv23_method())) == NULL)
 		@throw [OFInitializationFailedException