diff --git a/lib/jasmine/headless/spec_file_analyzer.rb b/lib/jasmine/headless/spec_file_analyzer.rb
index 0ac0899..f32308d 100644
--- a/lib/jasmine/headless/spec_file_analyzer.rb
+++ b/lib/jasmine/headless/spec_file_analyzer.rb
@@ -14,7 +14,7 @@ module Jasmine::Headless
       data = File.read(file)
 
       if data.respond_to?(:encode)
-        data.encode!('US-ASCII', 'UTF-8', :invalid => :replace)
+        data.encode!('US-ASCII', 'UTF-8', :invalid => :replace, :undef => :replace)
       else
         require 'iconv'
         ic = Iconv.new('UTF-8//IGNORE', 'US-ASCII')
diff --git a/spec/files/UTF-8-test.txt b/spec/files/UTF-8-test.txt
new file mode 100644
index 0000000..abd16f7
Binary files /dev/null and b/spec/files/UTF-8-test.txt differ
diff --git a/spec/lib/jasmine/headless/spec_file_analyzer_spec.rb b/spec/lib/jasmine/headless/spec_file_analyzer_spec.rb
index fbde25c..5a5dd72 100644
--- a/spec/lib/jasmine/headless/spec_file_analyzer_spec.rb
+++ b/spec/lib/jasmine/headless/spec_file_analyzer_spec.rb
@@ -1,7 +1,6 @@
 require 'spec_helper'
 
 describe Jasmine::Headless::SpecFileAnalyzer do
-  include FakeFS::SpecHelpers
 
   let(:file) { 'file' }
   let(:analyzer) { described_class.new(file) }
@@ -11,45 +10,57 @@ describe Jasmine::Headless::SpecFileAnalyzer do
       analyzer.action
     end
 
-    before do
-      File.open(file, 'wb') { |fh| fh.print file_data }
-    end
+    context 'fake files' do
+      include FakeFS::SpecHelpers
 
-    context 'coffeescript' do
-      let(:file_data) do
-        <<-SPEC
-describe 'test', ->
-  context 'yes', ->
-    it 'should do something', ->
-      "yes"
-      "PR.registerLangHandler(PR.createSimpleLexer([[\"com\",/^#[^\\n\\r]*/,null,\"#\"],[\"pln\",/^[\\t\\n\\r \\xa0]+/,null,\"\\t\\n\\r \xC2\\xa0\"],[\"str\",/^\"(?:[^\"\\\\]|\\\\[\\S\\s])*(?:\"|$)/,null,'\"']],[[\"kwd\",/^(?:ADS|AD|AUG|BZF|BZMF|CAE|CAF|CA|CCS|COM|CS|DAS|DCA|DCOM|DCS|DDOUBL|DIM|DOUBLE|DTCB|DTCF|DV|DXCH|EDRUPT|EXTEND|INCR|INDEX|NDX|INHINT|LXCH|MASK|MSK|MP|MSU|NOOP|OVSK|QXCH|RAND|READ|RELINT|RESUME|RETURN|ROR|RXOR|SQUARE|SU|TCR|TCAA|OVSK|TCF|TC|TS|WAND|WOR|WRITE|XCH|XLQ|XXALQ|ZL|ZQ|ADD|ADZ|SUB|SUZ|MPY|MPR|MPZ|DVP|COM|ABS|CLA|CLZ|LDQ|STO|STQ|ALS|LLS|LRS|TRA|TSQ|TMI|TOV|AXT|TIX|DLY|INP|OUT)\\s/,\n"
-SPEC
+      before do
+        File.open(file, 'wb') { |fh| fh.print file_data }
       end
 
-      it 'should get the line numbers' do
-        line_numbers['test'].should == [ 1 ]
-        line_numbers['yes'].should == [ 2 ]
-        line_numbers['should do something'].should == [ 3 ]
+      context 'coffeescript' do
+        let(:file_data) do
+          <<-SPEC
+  describe 'test', ->
+    context 'yes', ->
+      it 'should do something', ->
+        "yes"
+  SPEC
+        end
+
+        it 'should get the line numbers' do
+          line_numbers['test'].should == [ 1 ]
+          line_numbers['yes'].should == [ 2 ]
+          line_numbers['should do something'].should == [ 3 ]
+        end
       end
-    end
 
-    context 'javascript' do
-      let(:file_data) do
-        <<-SPEC
-describe('test', function() {
-  context('yes', function() {
-    it('should do something', function() {
+      context 'javascript' do
+        let(:file_data) do
+          <<-SPEC
+  describe('test', function() {
+    context('yes', function() {
+      it('should do something', function() {
 
+      });
     });
   });
-});
-SPEC
-      end
+  SPEC
+        end
 
-      it 'should get the line numbers' do
-        line_numbers['test'].should == [ 1 ]
-        line_numbers['yes'].should == [ 2 ]
-        line_numbers['should do something'].should == [ 3 ]
+        it 'should get the line numbers' do
+          line_numbers['test'].should == [ 1 ]
+          line_numbers['yes'].should == [ 2 ]
+          line_numbers['should do something'].should == [ 3 ]
+        end
+      end
+    end
+
+    context 'utf 8' do
+      let(:analyzer) { described_class.new('spec/files/UTF-8-test.txt') }
+      let(:file_data) { '' }
+
+      it 'should not explode' do
+        line_numbers
       end
     end
   end