diff --git a/pkgs/by-name/li/libpst/package.nix b/pkgs/by-name/li/libpst/package.nix
index c759994252b4..1778056f535e 100644
--- a/pkgs/by-name/li/libpst/package.nix
+++ b/pkgs/by-name/li/libpst/package.nix
@@ -18,7 +18,7 @@ stdenv.mkDerivation (finalAttrs: {
   version = "0.6.76";
 
   src = fetchurl {
-    url = "http://www.five-ten-sg.com/libpst/packages/libpst-${finalAttrs.version}.tar.gz";
+    url = "https://www.five-ten-sg.com/libpst/packages/libpst-${finalAttrs.version}.tar.gz";
     hash = "sha256-PSkb7rvbSNK5NGCLwGGVtkHaY9Ko9eDThvLp1tBaC0I=";
   };