diff --git a/pkgs/development/interpreters/ruby/default.nix b/pkgs/development/interpreters/ruby/default.nix
index d30a2d2073ea..07349cf4f91d 100644
--- a/pkgs/development/interpreters/ruby/default.nix
+++ b/pkgs/development/interpreters/ruby/default.nix
@@ -79,13 +79,13 @@ let
           ++ (op opensslSupport openssl)
           ++ (op gdbmSupport gdbm)
           ++ (op yamlSupport libyaml)
-          ++ (op jemallocSupport jemalloc)
           # Looks like ruby fails to build on darwin without readline even if curses
           # support is not enabled, so add readline to the build inputs if curses
           # support is disabled (if it's enabled, we already have it) and we're
           # running on darwin
           ++ op (!cursesSupport && stdenv.isDarwin) readline
           ++ ops stdenv.isDarwin [ libiconv libobjc libunwind Foundation ];
+        propagatedBuildInputs = op jemallocSupport jemalloc;
 
         enableParallelBuilding = true;