diff --git a/lib/configatron/proc.rb b/lib/configatron/proc.rb
index 3ea7a07..97234dd 100644
--- a/lib/configatron/proc.rb
+++ b/lib/configatron/proc.rb
@@ -18,7 +18,7 @@ def call
           @val = val
         end
       end
-      return val || @val
+      return val.nil? ? @val : val
     end
 
     def finalize?
diff --git a/test/unit/configatron/proc.rb b/test/unit/configatron/proc.rb
index 303d455..24d55c9 100644
--- a/test/unit/configatron/proc.rb
+++ b/test/unit/configatron/proc.rb
@@ -20,5 +20,11 @@ class Critic::Unit::ProcTest < Critic::Unit::Test
       @proc.stubs(:finalize?).returns(false)
       refute_equal(@proc.call, @proc.call)
     end
+
+    it 'sets and returns false in Dynamic' do
+      stubs(:rand).returns(false)
+      @proc.stubs(:finalize?).returns(false)
+      assert_equal(false, @proc.call)
+    end
   end
 end