diff --git a/pkgs/development/ruby-modules/gem-config/default.nix b/pkgs/development/ruby-modules/gem-config/default.nix
index 514411f3c5d9..d5595c04e3a2 100644
--- a/pkgs/development/ruby-modules/gem-config/default.nix
+++ b/pkgs/development/ruby-modules/gem-config/default.nix
@@ -211,6 +211,14 @@ in
     '';
   };
 
+  rb-readline = attrs: {
+    dontBuild = false;
+    postPatch = ''
+      substituteInPlace lib/rbreadline.rb \
+        --replace 'infocmp' '${ncurses.dev}/bin/infocmp'
+    '';
+  };
+
   timfel-krb5-auth = attrs: {
     buildInputs = [ kerberos ];
   };