diff --git a/pkgs/by-name/li/libestr/package.nix b/pkgs/by-name/li/libestr/package.nix
index b6f29972b134..ef53dac775aa 100644
--- a/pkgs/by-name/li/libestr/package.nix
+++ b/pkgs/by-name/li/libestr/package.nix
@@ -9,7 +9,7 @@ stdenv.mkDerivation (finalAttrs: {
   version = "0.1.11";
 
   src = fetchurl {
-    url = "http://libestr.adiscon.com/files/download/libestr-${finalAttrs.version}.tar.gz";
+    url = "https://libestr.adiscon.com/files/download/libestr-${finalAttrs.version}.tar.gz";
     sha256 = "0910ifzcs8kpd3srrr4fvbacgh2zrc6yn7i4rwfj6jpzhlkjnqs6";
   };