diff --git a/rtcclient/base.py b/rtcclient/base.py
index 91e5ed2..6f863c5 100644
--- a/rtcclient/base.py
+++ b/rtcclient/base.py
@@ -12,6 +12,7 @@ class RTCBase(object):
     log = logging.getLogger("base.RTCBase")
 
     CONTENT_XML = "text/xml"
+    OSLC_CORE_VERSION = "2.0"
     CONTENT_URL_ENCODED = "application/x-www-form-urlencoded"
     OSLC_CR_XML = "application/x-oslc-cm-change-request+xml"
     OSLC_CR_JSON = "application/x-oslc-cm-change-request+json"
diff --git a/rtcclient/client.py b/rtcclient/client.py
index c3da7d8..f219b5c 100644
--- a/rtcclient/client.py
+++ b/rtcclient/client.py
@@ -83,6 +83,7 @@ def _get_headers(self):
             _allow_redirects = False
 
         _headers = {"Content-Type": self.CONTENT_XML}
+        _headers["OSLC-Core-Version"] = self.OSLC_CORE_VERSION
         resp = self.get(self.url + "/authenticated/identity",
                         verify=False,
                         headers=_headers,