diff --git a/pkgs/by-name/po/polygraph/package.nix b/pkgs/by-name/po/polygraph/package.nix
index e2d697162543..dbde38c22c93 100644
--- a/pkgs/by-name/po/polygraph/package.nix
+++ b/pkgs/by-name/po/polygraph/package.nix
@@ -12,7 +12,7 @@ stdenv.mkDerivation (finalAttrs: {
   version = "4.13.0";
 
   src = fetchurl {
-    url = "http://www.web-polygraph.org/downloads/srcs/polygraph-${finalAttrs.version}-src.tgz";
+    url = "https://www.web-polygraph.org/downloads/srcs/polygraph-${finalAttrs.version}-src.tgz";
     sha256 = "1rwzci3n7q33hw3spd79adnclzwgwlxcisc9szzjmcjqhbkcpj1a";
   };