diff -r 4cfc19f667aa Lib/test/test_pep263.py
--- a/Lib/test/test_pep263.py	Wed Feb 10 05:44:01 2016 +0000
+++ b/Lib/test/test_pep263.py	Wed Feb 10 09:52:39 2016 +0200
@@ -63,6 +63,12 @@ class PEP263Test(unittest.TestCase):
                                      'codec did not return a unicode'):
             from test import bad_coding3
 
+    def test_bad_utf8(self):
+        with self.assertRaisesRegexp(SyntaxError, 'utf8'):
+            compile('# -*- coding: utf8 -*-\n#\xc3', 'dummy', 'exec')
+        with self.assertRaisesRegexp(SyntaxError, 'utf8'):
+            compile('# -*- coding: utf-8 -*-\n#\xc3', 'dummy', 'exec')
+
 
 def test_main():
     test_support.run_unittest(PEP263Test)
diff -r 4cfc19f667aa Parser/tokenizer.c
--- a/Parser/tokenizer.c	Wed Feb 10 05:44:01 2016 +0000
+++ b/Parser/tokenizer.c	Wed Feb 10 09:52:39 2016 +0200
@@ -285,8 +285,7 @@ check_coding_spec(const char* line, Py_s
         tok->read_coding_spec = 1;
         if (tok->encoding == NULL) {
             assert(tok->decoding_state == 1); /* raw */
-            if (strcmp(cs, "utf-8") == 0 ||
-                strcmp(cs, "iso-8859-1") == 0) {
+            if (strcmp(cs, "iso-8859-1") == 0) {
                 tok->encoding = cs;
             } else {
 #ifdef Py_USING_UNICODE