diff --git a/requests_oauthlib/compliance_fixes/__init__.py b/requests_oauthlib/compliance_fixes/__init__.py
index 8815ea0..ee4378e 100644
--- a/requests_oauthlib/compliance_fixes/__init__.py
+++ b/requests_oauthlib/compliance_fixes/__init__.py
@@ -7,3 +7,4 @@
 from .weibo import weibo_compliance_fix
 from .plentymarkets import plentymarkets_compliance_fix
 from .ebay import ebay_compliance_fix
+from .wix import wix_compliance_fix
diff --git a/requests_oauthlib/compliance_fixes/wix.py b/requests_oauthlib/compliance_fixes/wix.py
new file mode 100644
index 0000000..121a56b
--- /dev/null
+++ b/requests_oauthlib/compliance_fixes/wix.py
@@ -0,0 +1,36 @@
+import json
+from oauthlib.common import urldecode
+
+"""
+Wix requires the request body for token requests to be sent in JSON format
+instead of x-www-form-urlencoded.
+"""
+def wix_compliance_fix(session):
+
+    def _non_compliant_access_token_request_body(
+            url: str, headers: dict, request_kwargs: dict
+    ):
+        """
+        Move the request body from the `data` kwarg to the `json` kwarg,
+        and set the `Content-Type` header to `application/json`.
+        """
+        headers["Content-Type"] = "application/json"
+        request_kwargs["json"] = request_kwargs["data"]
+        del request_kwargs["data"]
+        return url, headers, request_kwargs
+
+    def _non_compliant_refresh_token_request_body(
+            token_url: str, headers: dict, body: str
+    ):
+        """
+        Convert the body from a urlencoded string to a JSON string,
+        and set the `Content-Type` header to `application/json`.
+        """
+        headers["Content-Type"] = "application/json"
+        body = json.dumps(dict(urldecode(body)))
+        return token_url, headers, body
+
+    session.register_compliance_hook("access_token_request", _non_compliant_access_token_request_body)
+    session.register_compliance_hook("refresh_token_request", _non_compliant_refresh_token_request_body)
+
+    return session
diff --git a/requests_oauthlib/oauth2_session.py b/requests_oauthlib/oauth2_session.py
index 93cc4d7..05ae35d 100644
--- a/requests_oauthlib/oauth2_session.py
+++ b/requests_oauthlib/oauth2_session.py
@@ -473,9 +473,12 @@ def refresh_token(
             log.debug("Invoking refresh_token_request hook %s.", hook)
             token_url, headers, body = hook(token_url, headers, body)
 
+        if headers['Content-Type'] == "application/x-www-form-urlencoded":
+            body = dict(urldecode(body))
+
         r = self.post(
             token_url,
-            data=dict(urldecode(body)),
+            data=body,
             auth=auth,
             timeout=timeout,
             headers=headers,
diff --git a/tests/test_compliance_fixes.py b/tests/test_compliance_fixes.py
index c5166bd..3892136 100644
--- a/tests/test_compliance_fixes.py
+++ b/tests/test_compliance_fixes.py
@@ -16,6 +16,7 @@
 from requests_oauthlib.compliance_fixes import instagram_compliance_fix
 from requests_oauthlib.compliance_fixes import plentymarkets_compliance_fix
 from requests_oauthlib.compliance_fixes import ebay_compliance_fix
+from requests_oauthlib.compliance_fixes.wix import wix_compliance_fix
 
 
 class FacebookComplianceFixTest(TestCase):
@@ -385,3 +386,46 @@ def test_refresh_token(self):
             "https://example.com/refresh",
         )
         assert token["token_type"] == "Bearer"
+
+
+class WixComplianceFixTest(TestCase):
+
+    def setUp(self):
+        wix = OAuth2Session()
+        self.session = wix_compliance_fix(wix)
+
+    def test_access_token_request_sent_as_json(self):
+        mocker = requests_mock.Mocker()
+        mocker.post(
+            "https://www.wixapis.com/oauth/access",
+            request_headers={"Content-Type": "application/json"},
+            json={"access_token": "sample_access_token", "refresh_token": "sample_refresh_token"},
+            additional_matcher=lambda req: req.json() == {'grant_type': 'authorization_code', 'code': 'sample_code'}
+        )
+        mocker.start()
+        self.addCleanup(mocker.stop)
+
+        token = self.session.fetch_token(
+            "https://www.wixapis.com/oauth/access",
+            code="sample_code"
+        )
+
+        self.assertEqual(token, {"access_token": "sample_access_token", "refresh_token": "sample_refresh_token"})
+
+    def test_refresh_token_request_sent_as_json(self):
+        mocker = requests_mock.Mocker()
+        mocker.post(
+            "https://www.wixapis.com/oauth/access",
+            request_headers={"Content-Type": "application/json"},
+            json={"access_token": "sample_access_token", "refresh_token": "sample_refresh_token"},
+            additional_matcher=lambda req: req.json() == {'grant_type': 'refresh_token', 'refresh_token': 'sample_refresh_token'}
+        )
+        mocker.start()
+        self.addCleanup(mocker.stop)
+
+        token = self.session.refresh_token(
+            "https://www.wixapis.com/oauth/access",
+            refresh_token="sample_refresh_token"
+        )
+
+        self.assertEqual(token, {"access_token": "sample_access_token", "refresh_token": "sample_refresh_token"})