diff --git a/libs/pbd/MSVCpbd/pbd.vcproj b/libs/pbd/MSVCpbd/pbd.vcproj
index e80a5181c7..892ee5b3d9 100644
--- a/libs/pbd/MSVCpbd/pbd.vcproj
+++ b/libs/pbd/MSVCpbd/pbd.vcproj
@@ -719,6 +719,10 @@
 				RelativePath="..\pbd\property_basics.h"
 				>
 			</File>
+			<File
+				RelativePath="..\pbd\pthread_utils.h"
+				>
+			</File>
 			<File
 				RelativePath="..\pbd\rcu.h"
 				>