diff --git a/lib/http_router.rb b/lib/http_router.rb
index 68dd495..b815077 100644
--- a/lib/http_router.rb
+++ b/lib/http_router.rb
@@ -20,10 +20,9 @@ class HttpRouter
   # Raised when a Route is not able to be generated due to a missing parameter.
   MissingParameterException   = Class.new(RuntimeError)
   # Raised when a Route is compiled twice
-  DoubleCompileError = Class.new(RuntimeError)
+  DoubleCompileError          = Class.new(RuntimeError)
   # Raised an invalid request value is used
-  InvalidRequestValueError = Class.new(RuntimeError)
-
+  InvalidRequestValueError    = Class.new(RuntimeError)
 
   # Creates a new HttpRouter.
   # Can be called with either <tt>HttpRouter.new(proc{|env| ... }, { .. options .. })</tt> or with the first argument omitted.
diff --git a/lib/http_router/node.rb b/lib/http_router/node.rb
index 1065875..e588825 100644
--- a/lib/http_router/node.rb
+++ b/lib/http_router/node.rb
@@ -69,8 +69,8 @@ def inject_root_methods(code = nil, &blk)
       code ? root.methods_module.module_eval(code) : root.methods_module.module_eval(&blk)
     end
 
-    def inject_root_ivar(name, val)
-      root.instance_variable_set(name, val)
+    def inject_root_ivar(obj)
+      root.inject_root_ivar(obj)
     end
 
     def add(matcher)
diff --git a/lib/http_router/node/lookup.rb b/lib/http_router/node/lookup.rb
index 8a1fd98..806c8d8 100644
--- a/lib/http_router/node/lookup.rb
+++ b/lib/http_router/node/lookup.rb
@@ -15,8 +15,7 @@ def usable?(other)
       end
 
       def to_code
-        lookup_ivar = :"@lookup_#{root.next_counter}"
-        inject_root_ivar(lookup_ivar, @map)
+        lookup_ivar = inject_root_ivar(@map)
         method_prefix = "lookup_#{root.next_counter} "
         inject_root_methods @map.keys.map {|k| 
           method = :"#{method_prefix}#{k}"
diff --git a/lib/http_router/node/path.rb b/lib/http_router/node/path.rb
index 5a2bfa6..efad900 100644
--- a/lib/http_router/node/path.rb
+++ b/lib/http_router/node/path.rb
@@ -23,8 +23,7 @@ def url(args, options)
       end
 
       def to_code
-        path_ivar = :"@path_#{root.next_counter}"
-        inject_root_ivar(path_ivar, self)
+        path_ivar = inject_root_ivar(self)
         "#{"if request.path_finished?" unless route.match_partially?}
           catch(:pass) do
             #{"if request.path.size == 1 && request.path.first == '' && (request.rack_request.head? || request.rack_request.get?) && request.rack_request.path_info[-1] == ?/
diff --git a/lib/http_router/node/root.rb b/lib/http_router/node/root.rb
index 1b9d543..53af40d 100644
--- a/lib/http_router/node/root.rb
+++ b/lib/http_router/node/root.rb
@@ -22,6 +22,12 @@ def next_counter
         @counter += 1
       end
 
+      def inject_root_ivar(obj)
+        name = :"@ivar_#{@counter += 1}"
+        root.instance_variable_set(name, obj)
+        name
+      end
+
       private
       def rewrite_partial_path_info(env, request)
         env['PATH_INFO'] = "/#{request.path.join('/')}"