diff --git a/configure.in b/configure.in
index 47072f434fc..c87e5102746 100644
--- a/configure.in
+++ b/configure.in
@@ -4324,6 +4324,7 @@ mail)
   MOZ_LDAP_XPCOM=1
   MOZ_STATIC_MAIL_BUILD=1
   MOZ_COMPOSER=1
+  MOZ_SAFE_BROWSING=1
   MOZ_SVG=
   MOZ_APP_VERSION=$THUNDERBIRD_VERSION
   MOZ_EXTENSIONS_DEFAULT=" wallet"