diff --git a/src/EFCore.Cosmos/Query/Internal/StringMethodTranslator.cs b/src/EFCore.Cosmos/Query/Internal/StringMethodTranslator.cs
index dc21aa2926d..9a7eab5e116 100644
--- a/src/EFCore.Cosmos/Query/Internal/StringMethodTranslator.cs
+++ b/src/EFCore.Cosmos/Query/Internal/StringMethodTranslator.cs
@@ -32,6 +32,9 @@ private static readonly MethodInfo _endsWithMethodInfo
 
         private static readonly MethodInfo _toLowerMethodInfo
             = typeof(string).GetRequiredRuntimeMethod(nameof(string.ToLower), Array.Empty<Type>());
+            
+        private static readonly MethodInfo _toUpperMethodInfo
+            = typeof(string).GetRequiredRuntimeMethod(nameof(string.ToUpper), Array.Empty<Type>());
 
         private static readonly MethodInfo _firstOrDefaultMethodInfoWithoutArgs
             = typeof(Enumerable).GetRuntimeMethods().Single(
@@ -105,6 +108,11 @@ public StringMethodTranslator([NotNull] ISqlExpressionFactory sqlExpressionFacto
                 {
                     return TranslateSystemFunction("LOWER", method.ReturnType, instance);
                 }
+                
+                if (_toUpperMethodInfo.Equals(method))
+                {
+                    return TranslateSystemFunction("UPPER", method.ReturnType, instance);
+                }
             }
 
             if (_firstOrDefaultMethodInfoWithoutArgs.Equals(method))
diff --git a/test/EFCore.Cosmos.FunctionalTests/Query/NorthwindFunctionsQueryCosmosTest.cs b/test/EFCore.Cosmos.FunctionalTests/Query/NorthwindFunctionsQueryCosmosTest.cs
index dd1daa52a21..4e249d0df3c 100644
--- a/test/EFCore.Cosmos.FunctionalTests/Query/NorthwindFunctionsQueryCosmosTest.cs
+++ b/test/EFCore.Cosmos.FunctionalTests/Query/NorthwindFunctionsQueryCosmosTest.cs
@@ -606,7 +606,6 @@ FROM root c
 WHERE (c[""Discriminator""] = ""OrderDetail"")");
         }
 
-        [ConditionalTheory(Skip = "Issue #17246")]
         public override async Task Where_string_to_upper(bool async)
         {
             await base.Where_string_to_upper(async);
@@ -614,7 +613,7 @@ public override async Task Where_string_to_upper(bool async)
             AssertSql(
                 @"SELECT c
 FROM root c
-WHERE (c[""Discriminator""] = ""Customer"")");
+WHERE ((c[""Discriminator""] = ""Customer"") AND (UPPER(c[""CustomerID""]) = ""ALFKI""))");
         }
 
         public override async Task Where_string_to_lower(bool async)