diff --git a/moto/s3/responses.py b/moto/s3/responses.py
index d340d16e4..b04cb9496 100755
--- a/moto/s3/responses.py
+++ b/moto/s3/responses.py
@@ -780,8 +780,13 @@ class ResponseObject(_TemplateEnvironmentMixin):
         tags = []
         # Optional if no tags are being sent:
         if parsed_xml['Tagging'].get('TagSet'):
-            for tag in parsed_xml['Tagging']['TagSet']['Tag']:
-                tags.append(FakeTag(tag['Key'], tag['Value']))
+            # If there is only 1 tag, then it's not a list:
+            if not isinstance(parsed_xml['Tagging']['TagSet']['Tag'], list):
+                tags.append(FakeTag(parsed_xml['Tagging']['TagSet']['Tag']['Key'],
+                                    parsed_xml['Tagging']['TagSet']['Tag']['Value']))
+            else:
+                for tag in parsed_xml['Tagging']['TagSet']['Tag']:
+                    tags.append(FakeTag(tag['Key'], tag['Value']))
 
         tag_set = FakeTagSet(tags)
         tagging = FakeTagging(tag_set)
diff --git a/tests/test_s3/test_s3.py b/tests/test_s3/test_s3.py
index cb40edb33..e4cb499b9 100644
--- a/tests/test_s3/test_s3.py
+++ b/tests/test_s3/test_s3.py
@@ -1441,6 +1441,19 @@ def test_boto3_put_bucket_tagging():
     bucket_name = "mybucket"
     s3.create_bucket(Bucket=bucket_name)
 
+    # With 1 tag:
+    resp = s3.put_bucket_tagging(Bucket=bucket_name,
+                                 Tagging={
+                                     "TagSet": [
+                                         {
+                                             "Key": "TagOne",
+                                             "Value": "ValueOne"
+                                         }
+                                     ]
+                                 })
+    resp['ResponseMetadata']['HTTPStatusCode'].should.equal(200)
+
+    # With multiple tags:
     resp = s3.put_bucket_tagging(Bucket=bucket_name,
                                  Tagging={
                                      "TagSet": [