diff --git a/src/audio/QGCAudioWorker.h b/src/audio/QGCAudioWorker.h
index 1d40322912c976340feb02b4cbc6c7049ab1ecbe..af0cd550877c23502f35c11339e5e94736250d53 100644
--- a/src/audio/QGCAudioWorker.h
+++ b/src/audio/QGCAudioWorker.h
@@ -16,6 +16,7 @@
 
 #if defined _MSC_VER && defined QGC_SPEECH_ENABLED
 // Documentation: http://msdn.microsoft.com/en-us/library/ee125082%28v=VS.85%29.aspx
+#include <basetyps.h>
 #include <sapi.h>
 #endif