diff --git a/src/Composer/Autoload/ClassMapGenerator.php b/src/Composer/Autoload/ClassMapGenerator.php
index 5d937433b..1ecf96bfe 100644
--- a/src/Composer/Autoload/ClassMapGenerator.php
+++ b/src/Composer/Autoload/ClassMapGenerator.php
@@ -162,7 +162,7 @@ class ClassMapGenerator
         }
 
         // strip heredocs/nowdocs
-        $contents = preg_replace('{<<<\s*(\'?)(\w+)\\1(?:\r\n|\n|\r)(?:.*?)(?:\r\n|\n|\r)\\2(?=\r\n|\n|\r|;)}s', 'null', $contents);
+        $contents = preg_replace('{<<<[ \t]*([\'"]?)(\w+)\\1(?:\r\n|\n|\r)(?:.*?)(?:\r\n|\n|\r)(?:\s*)\\2(?=\s+|[;,.)])}s', 'null', $contents);
         // strip strings
         $contents = preg_replace('{"[^"\\\\]*+(\\\\.[^"\\\\]*+)*+"|\'[^\'\\\\]*+(\\\\.[^\'\\\\]*+)*+\'}s', 'null', $contents);
         // strip leading non-php code if needed
diff --git a/tests/Composer/Test/Autoload/Fixtures/classmap/StripNoise.php b/tests/Composer/Test/Autoload/Fixtures/classmap/StripNoise.php
index 4c344089b..8944360ee 100644
--- a/tests/Composer/Test/Autoload/Fixtures/classmap/StripNoise.php
+++ b/tests/Composer/Test/Autoload/Fixtures/classmap/StripNoise.php
@@ -7,42 +7,81 @@ namespace Foo;
  */
 class StripNoise
 {
-    public function test()
+    public function test_heredoc()
     {
-        return <<<A
-class Fail2
+        return <<<HEREDOC
+class FailHeredocBasic
 {
-
 }
-A
-. <<<  AB
-class Fail3
+HEREDOC . <<<  WHITESPACE
+class FailHeredocWhitespace
 {
-
 }
-AB
-. <<<'TEST'
-class Fail4
+WHITESPACE . <<<"DOUBLEQUOTES"
+class FailHeredocDoubleQuotes
 {
-
 }
-TEST
-. <<< 'ANOTHER'
-class Fail5
+DOUBLEQUOTES . <<<	"DOUBLEQUOTESTABBED"
+class FailHeredocDoubleQuotesTabbed
 {
+}
+DOUBLEQUOTESTABBED . <<<HEREDOCPHP73
+  class FailHeredocPHP73
+  {
+  }
+  HEREDOCPHP73;
+    }
 
+    public function test_nowdoc()
+    {
+        return <<<'NOWDOC'
+class FailNowdocBasic
+{
 }
-ANOTHER
-. <<<	'ONEMORE'
-class Fail6
+NOWDOC . <<<  'WHITESPACE'
+class FailNowdocWhitespace
+{
+}
+WHITESPACE . <<<	'NOWDOCTABBED'
+class FailNowdocTabbed
 {
-
 }
-ONEMORE;
+NOWDOCTABBED . <<<'NOWDOCPHP73'
+  class FailNowdocPHP73
+  {
+  }
+  NOWDOCPHP73;
+    }
+
+    public function test_followed_by_parentheses()
+    {
+        return array(<<<PARENTHESES
+            class FailParentheses
+            {
+            }
+            PARENTHESES);
+    }
+
+    public function test_followed_by_comma()
+    {
+        return array(1, 2, <<<COMMA
+            class FailComma
+            {
+            }
+            COMMA, 3, 4);
+    }
+
+    public function test_followed_by_period()
+    {
+        return <<<PERIOD
+            class FailPeriod
+            {
+            }
+            PERIOD.'?>';
     }
 
-    public function test2()
+    public function test_simple_string()
     {
-        $class = 'class Fail4 {}';
+        return 'class FailSimpleString {}';
     }
 }