diff --git a/threads.c b/threads.c
index 98fd2c2..7f421dd 100644
--- a/threads.c
+++ b/threads.c
@@ -911,8 +911,10 @@ xmlCleanupThreads(void)
     xmlGenericError(xmlGenericErrorContext, "xmlCleanupThreads()\n");
 #endif
 #ifdef HAVE_PTHREAD_H
-    if ((libxml_is_threaded)  && (pthread_key_delete != NULL))
+    if ((libxml_is_threaded)  && (pthread_key_delete != NULL)) {
         pthread_key_delete(globalkey);
+	once_control = PTHREAD_ONCE_INIT;
+    }
 #elif defined(HAVE_WIN32_THREADS) && !defined(HAVE_COMPILER_TLS) && (!defined(LIBXML_STATIC) || defined(LIBXML_STATIC_FOR_DLL))
     if (globalkey != TLS_OUT_OF_INDEXES) {
         xmlGlobalStateCleanupHelperParams *p;