diff --git a/pkgs/applications/networking/browsers/firefox/update.nix b/pkgs/applications/networking/browsers/firefox/update.nix
index 4a24fe85b2ee..1fe3366020ed 100644
--- a/pkgs/applications/networking/browsers/firefox/update.nix
+++ b/pkgs/applications/networking/browsers/firefox/update.nix
@@ -9,7 +9,7 @@
 , gnupg
 , attrPath
 , runtimeShell
-, baseUrl ? "http://archive.mozilla.org/pub/firefox/releases/"
+, baseUrl ? "https://archive.mozilla.org/pub/firefox/releases/"
 , versionPrefix ? ""
 , versionSuffix ? ""
 , versionKey ? "version"