diff --git a/Lib/robotparser.py b/Lib/robotparser.py
index 447563fe654..726854b49f5 100644
--- a/Lib/robotparser.py
+++ b/Lib/robotparser.py
@@ -68,7 +68,9 @@ class RobotFileParser:
     def _add_entry(self, entry):
         if "*" in entry.useragents:
             # the default entry is considered last
-            self.default_entry = entry
+            if self.default_entry is None:
+                # the first default entry wins
+                self.default_entry = entry
         else:
             self.entries.append(entry)
 
@@ -120,7 +122,7 @@ class RobotFileParser:
                         entry.rulelines.append(RuleLine(line[1], True))
                         state = 2
         if state == 2:
-            self.entries.append(entry)
+            self._add_entry(entry)
 
 
     def can_fetch(self, useragent, url):
diff --git a/Lib/test/test_robotparser.py b/Lib/test/test_robotparser.py
index 431b8ffbd98..650b603fdb5 100644
--- a/Lib/test/test_robotparser.py
+++ b/Lib/test/test_robotparser.py
@@ -202,6 +202,20 @@ bad = ['/folder1/anotherfile.html']
 RobotTest(13, doc, good, bad, agent="googlebot")
 
 
+# 14. For issue #4108 (obey first * entry)
+doc = """
+User-agent: *
+Disallow: /some/path
+
+User-agent: *
+Disallow: /another/path
+"""
+
+good = ['/another/path']
+bad = ['/some/path']
+
+RobotTest(14, doc, good, bad)
+
 
 class TestCase(unittest.TestCase):
     def runTest(self):
diff --git a/Misc/NEWS b/Misc/NEWS
index b0e66a39b26..37b143b51b1 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -35,6 +35,9 @@ Core and Builtins
   when turned into an exception: in this case the exception simply
   gets ignored.
 
+- Issue #4108: In urllib.robotparser, if there are multiple 'User-agent: *'
+  entries, consider the first one.
+
 - Issue #9354: Provide getsockopt() in asyncore's file_wrapper.
 
 - In the unicode/str.format(), raise a ValueError when indexes to arguments are