diff --git a/mail-client/thunderbird/metadata.xml b/mail-client/thunderbird/metadata.xml
index f7572e4ec64ec..721f723be5d42 100644
--- a/mail-client/thunderbird/metadata.xml
+++ b/mail-client/thunderbird/metadata.xml
@@ -15,7 +15,6 @@
 	<flag name="custom-optimization">Build with user-specified compiler optimizations
 		(-Os, -O0, -O1, -O2, -O3) from CFLAGS (unsupported)</flag>
 	<flag name="jemalloc3">Enable or disable jemalloc3 (forced-on when supported prior to 38.0)</flag>
-	<flag name="gstreamer-0">Use gstreamer:0.10 instead of gstreamer:1 for media support</flag>
 	<flag name="system-cairo">Use the system-wide <pkg>x11-libs/cairo</pkg>
 		instead of bundled.</flag>
 	<flag name="system-harfbuzz">Use the system-wide <pkg>media-libs/harfbuzz</pkg>
diff --git a/www-client/firefox/metadata.xml b/www-client/firefox/metadata.xml
index b4b14c28af702..4402dddd3df13 100644
--- a/www-client/firefox/metadata.xml
+++ b/www-client/firefox/metadata.xml
@@ -13,7 +13,6 @@
 	<flag name="gtk2">Use the cairo-gtk2 rendering engine</flag>
 	<flag name="gmp-autoupdate">Allow Gecko Media Plugins (binary blobs) to be automatically
 		downloaded and kept up-to-date in user profiles</flag>
-	<flag name="gstreamer-0">Use gstreamer:0.10 instead of gstreamer:1 for media support</flag>
 	<flag name="hwaccel">Force-enable hardware-accelerated rendering (Mozilla bug 594876)</flag>
 	<flag name="jemalloc">Enable or disable jemalloc</flag>
 	<flag name="jemalloc3">Enable or disable jemalloc3 (forced-on when supported prior to 38.0)</flag>