diff --git a/pkgs/tools/networking/ddclient/default.nix b/pkgs/tools/networking/ddclient/default.nix
index 22539657b1f1..0d50b1b2c0f3 100644
--- a/pkgs/tools/networking/ddclient/default.nix
+++ b/pkgs/tools/networking/ddclient/default.nix
@@ -8,7 +8,7 @@ buildPerlPackage {
     sha256 = "f22ac7b0ec78e310d7b88a1cf636e5c00360b2ed9c087f231b3522ef3e6295f2";
   };
 
-  buildInputs = [ perlPackages.IOSocketSSL ];
+  buildInputs = [ perlPackages.IOSocketSSL perlPackages.DigestSHA1 ];
 
   patches = [ ./ddclient-foreground.patch ];