diff --git a/src/tools/msvc/Mkvcbuild.pm b/src/tools/msvc/Mkvcbuild.pm
index b057ecbd38..8fd893153a 100644
--- a/src/tools/msvc/Mkvcbuild.pm
+++ b/src/tools/msvc/Mkvcbuild.pm
@@ -156,6 +156,7 @@ sub mkvcbuild
 		push(@pgcommonallfiles, 'md5.c');
 		push(@pgcommonallfiles, 'sha1.c');
 		push(@pgcommonallfiles, 'sha2.c');
+		push(@pgcommonallfiles, 'unicode_category.c');
 	}
 
 	our @pgcommonfrontendfiles = (