diff --git a/src/libstrongswan/threading/thread.c b/src/libstrongswan/threading/thread.c
index 5b6f0d2ce..d3da1e379 100644
--- a/src/libstrongswan/threading/thread.c
+++ b/src/libstrongswan/threading/thread.c
@@ -413,6 +413,12 @@ void thread_exit(void *val)
 	pthread_exit(val);
 }
 
+/**
+ * A dummy thread value that reserved pthread_key_t value "0". A buggy PKCS#11
+ * library mangles this key, without owning it, so we allocate it for them.
+ */
+static thread_value_t *dummy1;
+
 /**
  * Described in header.
  */
@@ -420,6 +426,8 @@ void threads_init()
 {
 	private_thread_t *main_thread = thread_create_internal();
 
+	dummy1 = thread_value_create(NULL);
+
 	main_thread->id = 0;
 	main_thread->thread_id = pthread_self();
 	current_thread = thread_value_create(NULL);
@@ -443,6 +451,8 @@ void threads_deinit()
 {
 	private_thread_t *main_thread = (private_thread_t*)thread_current();
 
+	dummy1->destroy(dummy1);
+
 	main_thread->mutex->lock(main_thread->mutex);
 	thread_destroy(main_thread);
 	current_thread->destroy(current_thread);