diff --git a/lib/middleman/base.rb b/lib/middleman/base.rb
index 267c042d..5d994ce9 100644
--- a/lib/middleman/base.rb
+++ b/lib/middleman/base.rb
@@ -127,27 +127,6 @@ module Middleman::Base
       super(option, value, &nil)
     end
     
-    def build_reroute(&block)
-      @build_rerouters ||= []
-      @build_rerouters << block
-    end
-    
-    def reroute_builder(desination, request_path)
-      @build_rerouters ||= []
-      
-      result = [desination, request_path]
-      
-      @build_rerouters.each do |block|
-        output = block.call(desination, request_path)
-        if output
-          result = output
-          break
-        end
-      end
-      
-      result
-    end
-    
     def before_processing(&block)
       @before_processes ||= []
       @before_processes << block
diff --git a/lib/middleman/core_extensions/builder.rb b/lib/middleman/core_extensions/builder.rb
index bad03ec2..fc000ae7 100644
--- a/lib/middleman/core_extensions/builder.rb
+++ b/lib/middleman/core_extensions/builder.rb
@@ -16,5 +16,26 @@ module Middleman::CoreExtensions::Builder
       @run_after_build ||= []
       @run_after_build
     end
+    
+    def build_reroute(&block)
+      @build_rerouters ||= []
+      @build_rerouters << block
+    end
+    
+    def reroute_builder(desination, request_path)
+      @build_rerouters ||= []
+      
+      result = [desination, request_path]
+      
+      @build_rerouters.each do |block|
+        output = block.call(desination, request_path)
+        if output
+          result = output
+          break
+        end
+      end
+      
+      result
+    end
   end
 end
\ No newline at end of file