diff --git a/user_malloc.c b/user_malloc.c
index ca5e6e6..19a76dd 100644
--- a/user_malloc.c
+++ b/user_malloc.c
@@ -69,11 +69,8 @@
 #endif
 
 #if LOCK_THREADS
-#if HAVE_PTHREAD_H
-#include <pthread.h>
-#endif
-#if HAVE_PTHREADS_H
-#include <pthreads.h>
+#ifdef THREAD_INCLUDE
+#include THREAD_INCLUDE
 #endif
 #endif