diff --git a/lib/System/ThreadLocal.cpp b/lib/System/ThreadLocal.cpp
index 1c07036..8d119fb 100644
--- a/lib/System/ThreadLocal.cpp
+++ b/lib/System/ThreadLocal.cpp
@@ -30,7 +30,7 @@
 }
 #else
 
-#if defined(HAVE_PTHREAD_H) && defined(HAVE_PTHREAD_MUTEX_LOCK)
+#if defined(HAVE_PTHREAD_H) && defined(HAVE_PTHREAD_GETSPECIFIC)
 
 #include <cassert>
 #include <pthread.h>