diff --git a/Formula/libraw.rb b/Formula/libraw.rb
index 11b0da36f7f99..c77f509b33dfb 100644
--- a/Formula/libraw.rb
+++ b/Formula/libraw.rb
@@ -16,7 +16,7 @@ class Libraw < Formula
   depends_on "little-cms2"
 
   resource "librawtestfile" do
-    url "http://www.rawsamples.ch/raws/nikon/d1/RAW_NIKON_D1.NEF",
+    url "https://www.rawsamples.ch/raws/nikon/d1/RAW_NIKON_D1.NEF",
       :using => :nounzip
     sha256 "7886d8b0e1257897faa7404b98fe1086ee2d95606531b6285aed83a0939b768f"
   end