diff --git a/pkgs/by-name/gm/gmic/package.nix b/pkgs/by-name/gm/gmic/package.nix
index 143954e9cf49..1ed7224ac5d6 100644
--- a/pkgs/by-name/gm/gmic/package.nix
+++ b/pkgs/by-name/gm/gmic/package.nix
@@ -41,8 +41,8 @@ stdenv.mkDerivation (finalAttrs: {
   # Reference: src/Makefile, directive gmic_stdlib_community.h
   gmic_stdlib = fetchurl {
     name = "gmic_stdlib_community.h";
-    url = "http://gmic.eu/gmic_stdlib_community${lib.replaceStrings ["."] [""] finalAttrs.version}.h";
-    hash = "sha256-wq8yQ0pxEGH3sOmwmgQfRVluHAC4JBYgs2mto1PNLP4=";
+    url = "https://gmic.eu/gmic_stdlib_community${lib.replaceStrings ["."] [""] finalAttrs.version}.h";
+    hash = "sha256-LoqK8ADwzPpxhy2GvaxVjGyYEHAbhspyoIXuBXCLRtQ=";
   };
 
   nativeBuildInputs = [