diff --git a/bitbake/lib/bb/fetch2/__init__.py b/bitbake/lib/bb/fetch2/__init__.py
index 3529531ca1e..37fed16e4e0 100644
--- a/bitbake/lib/bb/fetch2/__init__.py
+++ b/bitbake/lib/bb/fetch2/__init__.py
@@ -290,12 +290,12 @@ class URI(object):
 
     def _param_str_split(self, string, elmdelim, kvdelim="="):
         ret = collections.OrderedDict()
-        for k, v in [x.split(kvdelim, 1) for x in string.split(elmdelim) if x]:
+        for k, v in [x.split(kvdelim, 1) if kvdelim in x else (x, None) for x in string.split(elmdelim) if x]:
             ret[k] = v
         return ret
 
     def _param_str_join(self, dict_, elmdelim, kvdelim="="):
-        return elmdelim.join([kvdelim.join([k, v]) for k, v in dict_.items()])
+        return elmdelim.join([kvdelim.join([k, v]) if v else k for k, v in dict_.items()])
 
     @property
     def hostport(self):
diff --git a/bitbake/lib/bb/tests/fetch.py b/bitbake/lib/bb/tests/fetch.py
index e988e26c0aa..85c1f79ff32 100644
--- a/bitbake/lib/bb/tests/fetch.py
+++ b/bitbake/lib/bb/tests/fetch.py
@@ -308,6 +308,21 @@ class URITest(unittest.TestCase):
             'params': {"someparam" : "1"},
             'query': {},
             'relative': True
+        },
+        "https://www.innodisk.com/Download_file?9BE0BF6657;downloadfilename=EGPL-T101.zip": {
+            'uri': 'https://www.innodisk.com/Download_file?9BE0BF6657;downloadfilename=EGPL-T101.zip',
+            'scheme': 'https',
+            'hostname': 'www.innodisk.com',
+            'port': None,
+            'hostport': 'www.innodisk.com',
+            'path': '/Download_file',
+            'userinfo': '',
+            'userinfo': '',
+            'username': '',
+            'password': '',
+            'params': {"downloadfilename" : "EGPL-T101.zip"},
+            'query': {"9BE0BF6657": None},
+            'relative': False
         }
 
     }