diff --git a/lexers/javascript.go b/lexers/javascript.go
index 5a09ff0..e7a0500 100644
--- a/lexers/javascript.go
+++ b/lexers/javascript.go
@@ -65,6 +65,7 @@ var Javascript = Register(MustNewLexer(
 		Filenames: []string{"*.js", "*.jsm"},
 		MimeTypes: []string{"application/javascript", "application/x-javascript", "text/x-javascript", "text/javascript"},
 		DotAll:    true,
+		EnsureNL:  true,
 	},
 	JavascriptRules,
 ))
diff --git a/lexers/testdata/javascript.actual b/lexers/testdata/javascript.actual
new file mode 100644
index 0000000..d0eac9a
--- /dev/null
+++ b/lexers/testdata/javascript.actual
@@ -0,0 +1,2 @@
+sum = parseInt(num1) + parseInt(num2) // "+" means "add"
+alert("Sum = " + sum)  // "+" means combine into a string
\ No newline at end of file
diff --git a/lexers/testdata/javascript.expected b/lexers/testdata/javascript.expected
new file mode 100644
index 0000000..094b337
--- /dev/null
+++ b/lexers/testdata/javascript.expected
@@ -0,0 +1,29 @@
+[
+  {"type":"NameOther","value":"sum"},
+  {"type":"Text","value":" "},
+  {"type":"Operator","value":"="},
+  {"type":"Text","value":" "},
+  {"type":"NameBuiltin","value":"parseInt"},
+  {"type":"Punctuation","value":"("},
+  {"type":"NameOther","value":"num1"},
+  {"type":"Punctuation","value":")"},
+  {"type":"Text","value":" "},
+  {"type":"Operator","value":"+"},
+  {"type":"Text","value":" "},
+  {"type":"NameBuiltin","value":"parseInt"},
+  {"type":"Punctuation","value":"("},
+  {"type":"NameOther","value":"num2"},
+  {"type":"Punctuation","value":")"},
+  {"type":"Text","value":" "},
+  {"type":"CommentSingle","value":"// \"+\" means \"add\"\n"},
+  {"type":"NameOther","value":"alert"},
+  {"type":"Punctuation","value":"("},
+  {"type":"LiteralStringDouble","value":"\"Sum = \""},
+  {"type":"Text","value":" "},
+  {"type":"Operator","value":"+"},
+  {"type":"Text","value":" "},
+  {"type":"NameOther","value":"sum"},
+  {"type":"Punctuation","value":")"},
+  {"type":"Text","value":"  "},
+  {"type":"CommentSingle","value":"// \"+\" means combine into a string\n"}
+]