diff --git a/libs/backends/MSVCbackends/portaudio_audiobackend.vcproj b/libs/backends/MSVCbackends/portaudio_audiobackend.vcproj
index 0bde2984ff..253def6fe3 100644
--- a/libs/backends/MSVCbackends/portaudio_audiobackend.vcproj
+++ b/libs/backends/MSVCbackends/portaudio_audiobackend.vcproj
@@ -326,10 +326,6 @@
 				RelativePath="..\portaudio\portaudio_io.h"
 				>
 			</File>
-			<File
-				RelativePath="..\portaudio\rt_thread.h"
-				>
-			</File>
 			<File
 				RelativePath="..\portaudio\winmmemidi_input_device.h"
 				>