diff --git a/include/wx/window.h b/include/wx/window.h
index cc879cfd98..214833cd5d 100644
--- a/include/wx/window.h
+++ b/include/wx/window.h
@@ -832,7 +832,9 @@ protected:
     //       The same holds for all other wxEvtHandler functions.
 
     using wxEvtHandler::ProcessEvent;
+#if wxUSE_THREADS
     using wxEvtHandler::ProcessThreadEvent;
+#endif
     using wxEvtHandler::SafelyProcessEvent;
     using wxEvtHandler::ProcessPendingEvents;
     using wxEvtHandler::AddPendingEvent;
diff --git a/src/common/sckaddr.cpp b/src/common/sckaddr.cpp
index 9e2b8682e7..e70932497f 100644
--- a/src/common/sckaddr.cpp
+++ b/src/common/sckaddr.cpp
@@ -148,7 +148,7 @@ IMPLEMENT_DYNAMIC_CLASS(wxUNIXaddress, wxSockAddress)
     typedef char wxGetservBuf[1024];
 #endif
 
-#ifdef wxHAS_MT_SAFE_GETBY_FUNCS
+#if defined(wxHAS_MT_SAFE_GETBY_FUNCS) || !wxUSE_THREADS
     #define wxLOCK_GETBY_MUTEX(name)
 #else // may need mutexes to protect getxxxbyxxx() calls
     #if defined(HAVE_GETHOSTBYNAME) || \