diff --git a/gnu/packages/admin.scm b/gnu/packages/admin.scm
index 4168035dd3642ef9973897e4888197093b360bf8..c3b86115a682a7aa2a28b9cec33e37a683632d74 100644
--- a/gnu/packages/admin.scm
+++ b/gnu/packages/admin.scm
@@ -1520,7 +1520,7 @@ (define-public testdisk
     (version "7.1")
     (source (origin
               (method url-fetch)
-              (uri (string-append "http://www.cgsecurity.org/testdisk-"
+              (uri (string-append "https://www.cgsecurity.org/testdisk-"
                                   version ".tar.bz2"))
               (sha256
                (base32