diff --git a/build-aux/msitool.py b/build-aux/msitool.py
index 3f4c127..86507b3 100755
--- a/build-aux/msitool.py
+++ b/build-aux/msitool.py
@@ -33,6 +33,10 @@
               "build the MSI binary, and set DESTDIR to point "
               "to the installation virtual root.", file=sys.stderr)
         sys.exit(1)
+
+    if "MANUFACTURER" not in os.environ:
+        os.environ["MANUFACTURER"] = "The Virt Viewer Project"
+
     vroot = os.environ["DESTDIR"]
 
     manifest = []