diff --git a/novaclient/tests/v3/test_flavors.py b/novaclient/tests/v3/test_flavors.py
index cf3e86513..4dadc0ab5 100644
--- a/novaclient/tests/v3/test_flavors.py
+++ b/novaclient/tests/v3/test_flavors.py
@@ -38,7 +38,7 @@ class FlavorsTest(test_flavors.FlavorsTest):
                 "ephemeral": ephemeral,
                 "id": id,
                 "swap": swap,
-                "rxtx_factor": rxtx_factor,
+                "os-flavor-rxtx:rxtx_factor": rxtx_factor,
                 "flavor-access:is_public": is_public,
             }
         }
diff --git a/novaclient/v3/flavors.py b/novaclient/v3/flavors.py
index 60553b2f5..e65f2f1f4 100644
--- a/novaclient/v3/flavors.py
+++ b/novaclient/v3/flavors.py
@@ -97,7 +97,7 @@ class FlavorManager(flavors.FlavorManager):
                 "id": id,
                 "swap": swap,
                 "ephemeral": ephemeral,
-                "rxtx_factor": rxtx_factor,
+                "os-flavor-rxtx:rxtx_factor": rxtx_factor,
                 "flavor-access:is_public": is_public,
             }
         }