diff --git a/storages/backends/gcloud.py b/storages/backends/gcloud.py
index 02aa519ba..8cefd12dc 100644
--- a/storages/backends/gcloud.py
+++ b/storages/backends/gcloud.py
@@ -182,12 +182,12 @@ def _save(self, name, content):
         if self.gzip and upload_params.get(CONTENT_TYPE) in self.gzip_content_types:
             content = self._compress_content(content)
             file_object.blob.content_encoding = 'gzip'
-            CONTENT_TYPE[CONTENT_ENCODING] = 'gzip'
+            upload_params[CONTENT_ENCODING] = 'gzip'
 
         for prop, val in blob_params.items():
             setattr(file_object.blob, prop, val)
 
-        file_object.blob.upload_from_file(content, rewind=True, size=content.size, **upload_params)
+        file_object.blob.upload_from_file(content, rewind=True, size=getattr(content, 'size', None), **upload_params)
         return cleaned_name
 
     def get_object_parameters(self, name):
diff --git a/storages/backends/s3boto3.py b/storages/backends/s3boto3.py
index 72d6b924e..0dc4e531c 100644
--- a/storages/backends/s3boto3.py
+++ b/storages/backends/s3boto3.py
@@ -232,7 +232,6 @@ def close(self):
 
 @deconstructible
 class S3Boto3Storage(CompressStorageMixin, BaseStorage):
-
     """
     Amazon Simple Storage Service using Boto3
 
diff --git a/tests/test_gcloud.py b/tests/test_gcloud.py
index 1ea18d258..dae551e73 100644
--- a/tests/test_gcloud.py
+++ b/tests/test_gcloud.py
@@ -11,6 +11,7 @@
 from google.cloud.storage.blob import Blob
 
 from storages.backends import gcloud
+from tests.test_s3boto3 import NonSeekableContentFile
 
 
 class GCloudTestCase(TestCase):
@@ -102,7 +103,7 @@ def test_save(self):
         self.storage._client.bucket.assert_called_with(self.bucket_name)
         self.storage._bucket.get_blob().upload_from_file.assert_called_with(
             content, rewind=True, size=len(data), content_type=mimetypes.guess_type(self.filename)[0],
-            content_encoding=None, predefined_acl=None)
+            predefined_acl=None)
 
     def test_save2(self):
         data = 'This is some test ủⓝï℅ⅆℇ content.'
@@ -114,7 +115,7 @@ def test_save2(self):
         self.storage._client.bucket.assert_called_with(self.bucket_name)
         self.storage._bucket.get_blob().upload_from_file.assert_called_with(
             content, rewind=True, size=len(data), content_type=mimetypes.guess_type(filename)[0],
-            content_encoding=None, predefined_acl=None)
+            predefined_acl=None)
 
     def test_save_with_default_acl(self):
         data = 'This is some test ủⓝï℅ⅆℇ content.'
@@ -131,7 +132,7 @@ def test_save_with_default_acl(self):
         self.storage._client.bucket.assert_called_with(self.bucket_name)
         self.storage._bucket.get_blob().upload_from_file.assert_called_with(
             content, rewind=True, size=len(data), content_type=mimetypes.guess_type(filename)[0],
-            content_encoding=None, predefined_acl='publicRead')
+            predefined_acl='publicRead')
 
     def test_delete(self):
         self.storage.delete(self.filename)
@@ -403,26 +404,62 @@ def test_cache_control(self):
         blob = bucket.get_blob(filename)
         self.assertEqual(blob.cache_control, cache_control)
 
-    def test_save_gzip(self):
+    def test_storage_save_gzipped(self):
         """
-        Test saving a file with gzip enabled.
+        Test saving a gzipped file
         """
-        self.storage.gzip = True
+        name = 'test_storage_save.gz'
+        content = ContentFile("I am gzip'd")
+        self.storage.save(name, content)
+        obj = self.storage._bucket.get_blob()
+        obj.upload_from_file.assert_called_with(
+            mock.ANY,
+            rewind=True,
+            size=11,
+            predefined_acl=None,
+            content_type=None
+        )
 
-        data = "I should be gzip'd"
-        filename = 'test_storage_save.css'
-        content = ContentFile(data)
-        self.storage.save(filename, content)
+    def test_storage_save_gzipped_non_seekable(self):
+        """
+        Test saving a gzipped file
+        """
+        name = 'test_storage_save.gz'
+        content = NonSeekableContentFile("I am gzip'd")
+        self.storage.save(name, content)
+        obj = self.storage._bucket.get_blob()
+        obj.upload_from_file.assert_called_with(
+            mock.ANY,
+            rewind=True,
+            size=11,
+            predefined_acl=None,
+            content_type=None
+        )
 
+    def test_storage_save_gzip(self):
+        """
+        Test saving a file with gzip enabled.
+        """
+        self.storage.gzip = True
+        name = 'test_storage_save.css'
+        content = ContentFile("I should be gzip'd")
+        self.storage.save(name, content)
         self.storage._client.bucket.assert_called_with(self.bucket_name)
         obj = self.storage._bucket.get_blob()
-        obj.upload_from_file.assert_called()
+        obj.upload_from_file.assert_called_with(
+            mock.ANY,
+            rewind=True,
+            size=None,
+            predefined_acl=None,
+            content_type='text/css',
+            content_encoding='gzip'
+        )
         args, kwargs = obj.upload_from_file.call_args
         content = args[0]
         zfile = gzip.GzipFile(mode='rb', fileobj=content)
         self.assertEqual(zfile.read(), b"I should be gzip'd")
 
-    def test__save_gzip_twice(self):
+    def test_storage_save_gzip_twice(self):
         """
         Test saving the same file content twice with gzip enabled.
         """
@@ -438,7 +475,14 @@ def test__save_gzip_twice(self):
         # Then
         self.storage._client.bucket.assert_called_with(self.bucket_name)
         obj = self.storage._bucket.get_blob()
-        obj.upload_from_file.assert_called()
+        obj.upload_from_file.assert_called_with(
+            mock.ANY,
+            rewind=True,
+            size=None,
+            predefined_acl=None,
+            content_type='text/css',
+            content_encoding='gzip'
+        )
         args, kwargs = obj.upload_from_file.call_args
         content = args[0]
         zfile = gzip.GzipFile(mode='rb', fileobj=content)