diff --git a/mozilla/mailnews/base/src/nsSubscribableServer.cpp b/mozilla/mailnews/base/src/nsSubscribableServer.cpp
index 1e4041ee051..0ec8fd0c2e9 100644
--- a/mozilla/mailnews/base/src/nsSubscribableServer.cpp
+++ b/mozilla/mailnews/base/src/nsSubscribableServer.cpp
@@ -396,14 +396,14 @@ nsSubscribableServer::PopulateSubscribeDatasource(nsIMsgWindow *aMsgWindow, PRBo
 }
 
 NS_IMETHODIMP
-nsSubscribableServer::Subscribe(const char *aName)
+nsSubscribableServer::Subscribe(const PRUnichar *aName)
 {
 	NS_ASSERTION(PR_FALSE,"override this.");
 	return NS_ERROR_FAILURE;
 }
 
 NS_IMETHODIMP
-nsSubscribableServer::Unsubscribe(const char *aName)
+nsSubscribableServer::Unsubscribe(const PRUnichar *aName)
 {
 	NS_ASSERTION(PR_FALSE,"override this.");
 	return NS_ERROR_FAILURE;