diff --git a/wolfssh/test.h b/wolfssh/test.h
index 4061ca5b..ea8f6b8c 100644
--- a/wolfssh/test.h
+++ b/wolfssh/test.h
@@ -949,7 +949,8 @@ static INLINE void WaitTcpReady(tcp_ready* ready)
 #ifdef WOLFSSH_TEST_THREADING
 
 
-#if !defined(WOLFSSH_OLD_THREADING) && !defined(WOLFSSH_OLDER_THREADING)
+#if !defined(WOLFSSH_OLD_THREADING) && !defined(WOLFSSH_OLDER_THREADING) && \
+    !defined(SINGLE_THREADED)
 
 static INLINE void ThreadStart(THREAD_CB fun, void* args, THREAD_TYPE* thread)
 {