diff --git a/pkgs/development/ruby-modules/bundler/default.nix b/pkgs/development/ruby-modules/bundler/default.nix
index 50b8725a0af..c3c544d5268 100644
--- a/pkgs/development/ruby-modules/bundler/default.nix
+++ b/pkgs/development/ruby-modules/bundler/default.nix
@@ -7,4 +7,8 @@ buildRubyGem rec {
   version = "1.12.5";
   sha256 = "1q84xiwm9j771lpmiply0ls9l2bpvl5axn3jblxjvrldh8di2pkc";
   dontPatchShebangs = true;
+
+  postFixup = ''
+    sed -i -e "s/activate_bin_path/bin_path/g" $out/bin/bundle
+  '';
 }
diff --git a/pkgs/development/ruby-modules/gem-config/default.nix b/pkgs/development/ruby-modules/gem-config/default.nix
index 95b5033cc9d..41c837f52f0 100644
--- a/pkgs/development/ruby-modules/gem-config/default.nix
+++ b/pkgs/development/ruby-modules/gem-config/default.nix
@@ -29,6 +29,21 @@ let
 in
 
 {
+  bundler = attrs:
+    let
+      templates = "${attrs.ruby.gemPath}/gems/${attrs.gemName}-${attrs.version}/lib/bundler/templates/";
+    in {
+      # patching shebangs would fail on the templates/Executable file, so we
+      # temporarily remove the executable flag.
+      preFixup  = "chmod -x $out/${templates}/Executable";
+      postFixup = ''
+        chmod +x $out/${templates}/Executable
+
+        # Allows to load another bundler version
+        sed -i -e "s/activate_bin_path/bin_path/g" $out/bin/bundle
+      '';
+    };
+
   capybara-webkit = attrs: {
     buildInputs = [ qt48 ];
   };
@@ -177,14 +192,5 @@ in
     '';
   };
 
-  # patching shebangs would fail on the templates/Executable file, so we
-  # temporarily remove the executable flag.
-  bundler = attrs:
-    let
-      templates = "${attrs.ruby.gemPath}/gems/${attrs.gemName}-${attrs.version}/lib/bundler/templates/";
-    in {
-      preFixup  = "chmod -x $out/${templates}/Executable";
-      postFixup = "chmod +x $out/${templates}/Executable";
-    };
 }