diff --git a/pkgs/applications/networking/browsers/chromium/default.nix b/pkgs/applications/networking/browsers/chromium/default.nix
index 6270d4c8dc1..a5baa69bcfa 100644
--- a/pkgs/applications/networking/browsers/chromium/default.nix
+++ b/pkgs/applications/networking/browsers/chromium/default.nix
@@ -59,7 +59,8 @@ in let
     unpackCmd = let
       chan = if upstream-info.channel == "dev"    then "chrome-unstable"
         else if upstream-info.channel == "stable" then "chrome"
-        else "chrome-${upstream-info.channel}";
+        else if upstream-info.channel == "beta" then "chrome-beta"
+        else throw "Unknown chromium channel.";
     in ''
       mkdir -p plugins
       ar p "$src" data.tar.xz | tar xJ -C plugins --strip-components=4 \