diff --git a/mail-client/thunderbird/metadata.xml b/mail-client/thunderbird/metadata.xml
index c839ecf417ad9..e1e8d20be27b7 100644
--- a/mail-client/thunderbird/metadata.xml
+++ b/mail-client/thunderbird/metadata.xml
@@ -14,8 +14,6 @@
 		for faster binaries. This option will double the compile time.</flag>
 	<flag name="pulseaudio">Add sound server support via media-libs/libpulse (may be PulseAudio or
 		Pipewire, or apulse if installed)</flag>
-	<flag name="rust-extensions">Compile and install experimental rust extensions, that may become
-		part of Thunderbird some day.</flag>
 	<flag name="sndio">Enable support for the <pkg>media-sound/sndio</pkg> backend</flag>
 	<flag name="system-av1">Use the system-wide <pkg>media-libs/dav1d</pkg>
 		and <pkg>media-libs/libaom</pkg> library instead of bundled.</flag>