diff --git a/pkgs/by-name/ec/eclipse-mat/package.nix b/pkgs/by-name/ec/eclipse-mat/package.nix
index 1bd1223b828d..3f0dfba9ca2a 100644
--- a/pkgs/by-name/ec/eclipse-mat/package.nix
+++ b/pkgs/by-name/ec/eclipse-mat/package.nix
@@ -33,7 +33,7 @@ stdenv.mkDerivation rec {
   version = pVersion;
 
   src = fetchurl {
-    url = "http://ftp.halifax.rwth-aachen.de/eclipse//mat/${baseVersion}/rcp/MemoryAnalyzer-${version}-linux.gtk.x86_64.zip";
+    url = "https://ftp.halifax.rwth-aachen.de/eclipse//mat/${baseVersion}/rcp/MemoryAnalyzer-${version}-linux.gtk.x86_64.zip";
     sha256 = "sha256-icmo5zdK0XaH32kXwZUVaQ0VPSGEgvlLr7v7PtdbmCg=";
   };