diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 58c97197b..dd1d451ad 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -17,6 +17,10 @@ Unreleased
 ----------
 * nothing unreleased
 
+[5.5.1]
+--------
+* fix: Fixed the query fetching enterprise customer members
+
 [5.5.0]
 -------
 * feat: introduce Waffle flag for enabling the Learner Portal BFF API.
diff --git a/enterprise/__init__.py b/enterprise/__init__.py
index 961aea59c..42f110a41 100644
--- a/enterprise/__init__.py
+++ b/enterprise/__init__.py
@@ -2,4 +2,4 @@
 Your project description goes here.
 """
 
-__version__ = "5.5.0"
+__version__ = "5.5.1"
diff --git a/enterprise/api/v1/views/enterprise_customer_members.py b/enterprise/api/v1/views/enterprise_customer_members.py
index ca292aa4c..2c6437671 100644
--- a/enterprise/api/v1/views/enterprise_customer_members.py
+++ b/enterprise/api/v1/views/enterprise_customer_members.py
@@ -78,7 +78,7 @@ def get_members(self, request, *args, **kwargs):
                     au.id,
                     au.email,
                     au.date_joined,
-                    coalesce(NULLIF(aup.name, ''), (au.first_name || ' ' || au.last_name)) as full_name
+                    coalesce(NULLIF(aup.name, ''), au.username) as full_name
                 FROM enterprise_enterprisecustomeruser ecu
                 INNER JOIN auth_user as au on ecu.user_id = au.id
                 LEFT JOIN auth_userprofile as aup on au.id = aup.user_id
diff --git a/enterprise/models.py b/enterprise/models.py
index 6e559fc63..3971c5697 100644
--- a/enterprise/models.py
+++ b/enterprise/models.py
@@ -4699,7 +4699,7 @@ def _get_filtered_ecu_ids(self, user_query):
             with users as (
                 select ecu.id,
                 au.email,
-                coalesce(NULLIF(aup.name, ''), (au.first_name || ' ' || au.last_name)) as full_name
+                coalesce(NULLIF(aup.name, ''), au.username) as full_name
                 from enterprise_enterprisecustomeruser ecu
                 inner join auth_user au on ecu.user_id = au.id
                 left join auth_userprofile aup on au.id = aup.user_id