diff --git a/MarkMpn.Sql4Cds.Engine.FetchXml.Tests/FetchXml2SqlTests.cs b/MarkMpn.Sql4Cds.Engine.FetchXml.Tests/FetchXml2SqlTests.cs
index 5515d54e..b1e3bd43 100644
--- a/MarkMpn.Sql4Cds.Engine.FetchXml.Tests/FetchXml2SqlTests.cs
+++ b/MarkMpn.Sql4Cds.Engine.FetchXml.Tests/FetchXml2SqlTests.cs
@@ -116,6 +116,29 @@ public void JoinAlias()
             Assert.AreEqual("SELECT contact.firstname, contact.lastname, a.name FROM contact INNER JOIN account AS a ON contact.parentcustomerid = a.accountid", NormalizeWhitespace(converted));
         }
 
+        [TestMethod]
+        public void JoinAliasFilter()
+        {
+            var metadata = new AttributeMetadataCache(_service);
+            var fetch = @"
+                <fetch>
+                    <entity name='contact'>
+                        <attribute name='firstname' />
+                        <attribute name='lastname' />
+                        <link-entity name='account' from='accountid' to='parentcustomerid' alias='a'>
+                            <attribute name='name' />
+                        </link-entity>
+                        <filter>
+                            <condition attribute='name' operator='eq' value='data8' entityname='a' />
+                        </filter>
+                    </entity>
+                </fetch>";
+
+            var converted = FetchXml2Sql.Convert(_service, metadata, fetch, new FetchXml2SqlOptions(), out _);
+
+            Assert.AreEqual("SELECT contact.firstname, contact.lastname, a.name FROM contact INNER JOIN account AS a ON contact.parentcustomerid = a.accountid WHERE a.name = 'data8'", NormalizeWhitespace(converted));
+        }
+
         [TestMethod]
         public void Order()
         {
diff --git a/MarkMpn.Sql4Cds.Engine/FetchXml2Sql.cs b/MarkMpn.Sql4Cds.Engine/FetchXml2Sql.cs
index 067a5369..ae371932 100644
--- a/MarkMpn.Sql4Cds.Engine/FetchXml2Sql.cs
+++ b/MarkMpn.Sql4Cds.Engine/FetchXml2Sql.cs
@@ -72,7 +72,7 @@ public static string Convert(IOrganizationService org, IAttributeMetadataCache m
             var aliasToLogicalName = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
 
             // Link entities can also affect the WHERE clause
-            var filter = GetFilter(org, metadata, entity.Items, entity.name, aliasToLogicalName, options, ctes, parameterValues, ref requiresTimeZone, ref usesToday);
+            BooleanExpression filter = null;
 
             if (entity != null)
             {
@@ -117,6 +117,8 @@ public static string Convert(IOrganizationService org, IAttributeMetadataCache m
             }
 
             // WHERE
+            filter = CombineExpressions(filter, BooleanBinaryExpressionType.And, GetFilter(org, metadata, entity.Items, entity.name, aliasToLogicalName, options, ctes, parameterValues, ref requiresTimeZone, ref usesToday));
+
             if (filter != null)
             {
                 query.WhereClause = new WhereClause
@@ -639,12 +641,12 @@ private static TableReference BuildJoins(IOrganizationService org, IAttributeMet
 
         private static BooleanExpression CombineExpressions(BooleanExpression expr1, BooleanBinaryExpressionType type, BooleanExpression expr2)
         {
+            if (expr1 == null || expr2 == null)
+                return expr1 ?? expr2;
+
             if (expr2 is BooleanBinaryExpression bbe && bbe.BinaryExpressionType != type)
                 expr2 = new BooleanParenthesisExpression { Expression = expr2 };
 
-            if (expr1 == null)
-                return expr2;
-            
             if (expr1 is BooleanBinaryExpression lhs && lhs.BinaryExpressionType != type)
                 expr2 = new BooleanParenthesisExpression { Expression = expr1 };