diff --git a/.travis.yml b/.travis.yml
index a484482..a3dc865 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,3 +1,5 @@
+before_install:
+  - gem install bundler
 rvm:
   - "2.1.5"
   - "2.1.4"
diff --git a/lib/imgkit/source.rb b/lib/imgkit/source.rb
index 9340036..393e680 100644
--- a/lib/imgkit/source.rb
+++ b/lib/imgkit/source.rb
@@ -1,27 +1,30 @@
+require 'uri'
+
 class IMGKit
-  
+
   class Source
-        
+    URL_REGEX = /\A#{URI.regexp(['http', 'https'])}\z/
+
     def initialize(url_file_or_html)
       @source = url_file_or_html
     end
-    
+
     def url?
-      @source.is_a?(String) && @source.match(/\Ahttp/)
+      @source.is_a?(String) && @source.match(URL_REGEX)
     end
-    
+
     def file?
       @source.kind_of?(File) || @source.kind_of?(Tempfile)
     end
-    
+
     def html?
       !(url? || file?)
     end
-    
+
     def to_s
       file? ? @source.path : @source
     end
-    
+
   end
-  
+
 end
diff --git a/spec/source_spec.rb b/spec/source_spec.rb
index 4234fb4..17d4c26 100644
--- a/spec/source_spec.rb
+++ b/spec/source_spec.rb
@@ -1,18 +1,18 @@
 require 'spec_helper'
 
 describe IMGKit::Source do
-  
+
   describe "#url?" do
     it "should return true if passed a url like string" do
       source = IMGKit::Source.new('http://google.com')
       source.should be_url
     end
-    
+
     it "should return false if passed a file" do
       source = IMGKit::Source.new(File.new(__FILE__))
       source.should_not be_url
     end
-    
+
     it "should return false if passed HTML" do
       source = IMGKit::Source.new('<blink>Oh Hai!</blink>')
       source.should_not be_url
@@ -22,8 +22,13 @@
       source = IMGKit::Source.new("<blink>Oh Hai!</blink>\nhttp://google.com")
       source.should_not be_url
     end
+
+    it "should return false if passed string starts with http but is not a url" do
+      source = IMGKit::Source.new('http')
+      source.should_not be_url
+    end
   end
-  
+
   describe "#file?" do
     it "should return true if passed a file" do
       source = IMGKit::Source.new(File.new(__FILE__))
@@ -34,50 +39,50 @@
       source = IMGKit::Source.new(Tempfile.new 'temp_file')
       source.should be_file
     end
-    
+
     it "should return false if passed a url like string" do
       source = IMGKit::Source.new('http://google.com')
       source.should_not be_file
     end
-    
+
     it "should return false if passed HTML" do
       source = IMGKit::Source.new('<blink>Oh Hai!</blink>')
       source.should_not be_file
     end
   end
-  
+
   describe "#html?" do
     it "should return true if passed HTML" do
       source = IMGKit::Source.new('<blink>Oh Hai!</blink>')
       source.should be_html
     end
-    
+
     it "should return false if passed a file" do
       source = IMGKit::Source.new(File.new(__FILE__))
       source.should_not be_html
     end
-    
+
     it "should return false if passed a url like string" do
       source = IMGKit::Source.new('http://google.com')
       source.should_not be_html
     end
   end
-  
+
   describe "#to_s" do
     it "should return the HTML if passed HTML" do
       source = IMGKit::Source.new('<blink>Oh Hai!</blink>')
       source.to_s.should == '<blink>Oh Hai!</blink>'
     end
-    
+
     it "should return a path if passed a file" do
       source = IMGKit::Source.new(File.new(__FILE__))
       source.to_s.should == __FILE__
     end
-    
+
     it "should return the url if passed a url like string" do
       source = IMGKit::Source.new('http://google.com')
       source.to_s.should == 'http://google.com'
     end
   end
-  
+
 end