diff --git a/pkgs/by-name/gr/grepcidr/package.nix b/pkgs/by-name/gr/grepcidr/package.nix
index 572ffb8d9530..c32acfcf0da6 100644
--- a/pkgs/by-name/gr/grepcidr/package.nix
+++ b/pkgs/by-name/gr/grepcidr/package.nix
@@ -9,7 +9,7 @@ stdenv.mkDerivation (finalAttrs: {
   version = "2.0";
 
   src = fetchurl {
-    url = "http://www.pc-tools.net/files/unix/grepcidr-${finalAttrs.version}.tar.gz";
+    url = "https://www.pc-tools.net/files/unix/grepcidr-${finalAttrs.version}.tar.gz";
     sha256 = "1yzpa1nigmmp4hir6377hrkpp0z6jnxgccaw2jbqgydbglvnm231";
   };