diff --git a/ext/libssh_ruby/extconf.rb b/ext/libssh_ruby/extconf.rb
index 9a511c4..9b44214 100644
--- a/ext/libssh_ruby/extconf.rb
+++ b/ext/libssh_ruby/extconf.rb
@@ -8,6 +8,7 @@
 
 have_header('libssh/libssh.h')
 have_library('ssh')
+have_library('ssh_threads')
 have_const('SSH_KEYTYPE_ED25519', 'libssh/libssh.h')
 
 create_makefile('libssh/libssh_ruby')
diff --git a/ext/libssh_ruby/libssh_ruby.c b/ext/libssh_ruby/libssh_ruby.c
index ad829c6..2a71b7a 100644
--- a/ext/libssh_ruby/libssh_ruby.c
+++ b/ext/libssh_ruby/libssh_ruby.c
@@ -1,4 +1,5 @@
 #include "libssh_ruby.h"
+#include <libssh/callbacks.h>
 
 VALUE rb_mLibSSH;
 
@@ -26,6 +27,9 @@ static VALUE m_version(int argc, VALUE *argv, RB_UNUSED_VAR(VALUE self)) {
 }
 
 void Init_libssh_ruby(void) {
+  ssh_threads_set_callbacks(ssh_threads_get_pthread());
+  ssh_init();
+
   rb_mLibSSH = rb_define_module("LibSSH");
 
   /* @see Session#server_known */