diff --git a/mail/installer/windows/basemail-win b/mail/installer/windows/basemail-win
index 4d9069a741c7..4679fd900fab 100644
--- a/mail/installer/windows/basemail-win
+++ b/mail/installer/windows/basemail-win
@@ -18,6 +18,7 @@ thunderbird\defaults\profile\mimeTypes.rdf
 [xpcom]
 thunderbird\xpcom.dll
 thunderbird\xpcom_compat.dll
+thunderbird\components\xpcom_compat_c.dll
 thunderbird\xpistub.dll
 thunderbird\components\jar50.dll
 thunderbird\components\xpcom_base.xpt