diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 4cc46b6836d..0c127b49d34 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -1410,7 +1410,9 @@ let
 
   s3cmd = callPackage ../tools/networking/s3cmd { };
 
-  s3sync = callPackage ../tools/networking/s3sync { };
+  s3sync = callPackage ../tools/networking/s3sync {
+    ruby = ruby18;
+  };
 
   sablotron = callPackage ../tools/text/xml/sablotron { };