diff --git a/pkgs/tools/networking/tcpdump/default.nix b/pkgs/tools/networking/tcpdump/default.nix
index 7fdea769b1c8..01ff3c84f282 100644
--- a/pkgs/tools/networking/tcpdump/default.nix
+++ b/pkgs/tools/networking/tcpdump/default.nix
@@ -5,7 +5,7 @@ stdenv.mkDerivation rec {
   version = "4.99.4";
 
   src = fetchurl {
-    url = "http://www.tcpdump.org/release/tcpdump-${version}.tar.gz";
+    url = "https://www.tcpdump.org/release/tcpdump-${version}.tar.gz";
     hash = "sha256-AjIjG7LynWvyQm5woIp+DGOg1ZqbRIY7f14jV6bkn+o=";
   };