diff --git a/lib/core-net/close.c b/lib/core-net/close.c
index 94f98589c..4bc34031d 100644
--- a/lib/core-net/close.c
+++ b/lib/core-net/close.c
@@ -570,7 +570,7 @@ just_kill_connection:
 	lwsl_wsi_debug(wsi, "real just_kill_connection A: (sockfd %d)",
 			wsi->desc.sockfd);
 
-#if defined(LWS_WITH_THREADPOOL)
+#if defined(LWS_WITH_THREADPOOL) && defined(LWS_HAVE_PTHREAD_H)
 	lws_threadpool_wsi_closing(wsi);
 #endif
 
diff --git a/lib/core-net/private-lib-core-net.h b/lib/core-net/private-lib-core-net.h
index fc24755d7..5dbd097d3 100644
--- a/lib/core-net/private-lib-core-net.h
+++ b/lib/core-net/private-lib-core-net.h
@@ -715,7 +715,7 @@ struct lws {
 
 	lws_log_cx_t			*log_cx;
 
-#if defined(LWS_WITH_THREADPOOL)
+#if defined(LWS_WITH_THREADPOOL) && defined(LWS_HAVE_PTHREAD_H)
 	lws_dll2_owner_t		tp_task_owner; /* struct lws_threadpool_task */
 #endif
 
diff --git a/lib/core/private-lib-core.h b/lib/core/private-lib-core.h
index 6c59d7d9c..93192e9b3 100644
--- a/lib/core/private-lib-core.h
+++ b/lib/core/private-lib-core.h
@@ -665,7 +665,7 @@ struct lws_context {
 	mbedtls_ctr_drbg_context mcdc;
 #endif
 
-#if defined(LWS_WITH_THREADPOOL)
+#if defined(LWS_WITH_THREADPOOL) && defined(LWS_HAVE_PTHREAD_H)
 	struct lws_threadpool *tp_list_head;
 #endif
 
diff --git a/lib/roles/pipe/ops-pipe.c b/lib/roles/pipe/ops-pipe.c
index 4d39d311d..ad54a04fa 100644
--- a/lib/roles/pipe/ops-pipe.c
+++ b/lib/roles/pipe/ops-pipe.c
@@ -60,7 +60,7 @@ rops_handle_POLLIN_pipe(struct lws_context_per_thread *pt, struct lws *wsi,
 		return LWS_HPI_RET_PLEASE_CLOSE_ME;
 #endif
 
-#if defined(LWS_WITH_THREADPOOL)
+#if defined(LWS_WITH_THREADPOOL) && defined(LWS_HAVE_PTHREAD_H)
 	/*
 	 * threadpools that need to call for on_writable callbacks do it by
 	 * marking the task as needing one for its wsi, then cancelling service.