diff --git a/Rubberduck.Refactorings/EncapsulateField/ConflictDetection/EncapsulateFieldConflictFinder.cs b/Rubberduck.Refactorings/EncapsulateField/ConflictDetection/EncapsulateFieldConflictFinder.cs
index cf1126ee17..00eedd424f 100644
--- a/Rubberduck.Refactorings/EncapsulateField/ConflictDetection/EncapsulateFieldConflictFinder.cs
+++ b/Rubberduck.Refactorings/EncapsulateField/ConflictDetection/EncapsulateFieldConflictFinder.cs
@@ -85,8 +85,14 @@ public EncapsulateFieldConflictFinder(IDeclarationFinderProvider declarationFind
                     && rf.Context.TryGetAncestor<VBAParser.RedimVariableDeclarationContext>(out _)))
                 {
                     errorMessage = string.Format(RubberduckUI.EncapsulateField_ArrayHasExternalRedimFormat, field.IdentifierName);
+                    return (false, errorMessage);
+                }
+
+                if (field is IEncapsulateFieldAsUDTMemberCandidate udtMember
+                    && VBAIdentifierValidator.TryMatchInvalidIdentifierCriteria(udtMember.UserDefinedTypeMemberIdentifier, declarationType, out errorMessage, true))
+                {
+                    return (false, errorMessage);
                 }
-                return (!string.IsNullOrEmpty(errorMessage), errorMessage);
             }
 
             var hasConflictFreeValidIdentifiers = 
diff --git a/RubberduckTests/Refactoring/EncapsulateField/EncapsulateFieldUseBackingField/EncapsulateArrayFieldTests.cs b/RubberduckTests/Refactoring/EncapsulateField/EncapsulateFieldUseBackingField/EncapsulateArrayFieldTests.cs
index 424dcf7d54..78d8f9b0f8 100644
--- a/RubberduckTests/Refactoring/EncapsulateField/EncapsulateFieldUseBackingField/EncapsulateArrayFieldTests.cs
+++ b/RubberduckTests/Refactoring/EncapsulateField/EncapsulateFieldUseBackingField/EncapsulateArrayFieldTests.cs
@@ -203,11 +203,12 @@ End Sub
 
             var field = model[fieldUT];
 
-            field.TryValidateEncapsulationAttributes(out var errorMessage);
+            var result = field.TryValidateEncapsulationAttributes(out var errorMessage);
 
             var expectedError = string.Format(RubberduckUI.EncapsulateField_ArrayHasExternalRedimFormat, field.IdentifierName);
 
             StringAssert.AreEqualIgnoringCase(expectedError, errorMessage);
+            Assert.IsFalse(result);
         }
 
         protected override IRefactoring TestRefactoring(
diff --git a/RubberduckTests/Refactoring/EncapsulateField/EncapsulateFieldValidatorTests.cs b/RubberduckTests/Refactoring/EncapsulateField/EncapsulateFieldValidatorTests.cs
index f0ed03be4b..7a9de08672 100644
--- a/RubberduckTests/Refactoring/EncapsulateField/EncapsulateFieldValidatorTests.cs
+++ b/RubberduckTests/Refactoring/EncapsulateField/EncapsulateFieldValidatorTests.cs
@@ -8,6 +8,7 @@
 using Rubberduck.Parsing.Symbols;
 using Rubberduck.VBEditor.SafeComWrappers;
 using System.Linq;
+using Rubberduck.Resources;
 
 namespace RubberduckTests.Refactoring.EncapsulateField
 {
@@ -502,7 +503,10 @@ public void UDTReservedMemberArrayIdentifier()
 
             var model = Support.RetrieveUserModifiedModelPriorToRefactoring(vbe, fieldName, DeclarationType.Variable, presenterAction);
 
-            Assert.AreEqual(false, model[fieldName].TryValidateEncapsulationAttributes(out var message), message);
+            Assert.AreEqual(false, model[fieldName].TryValidateEncapsulationAttributes(out var errorMessage), errorMessage);
+
+            var expectedMessage = string.Format(RubberduckUI.InvalidNameCriteria_IsReservedKeywordFormat, fieldName);
+            Assert.AreEqual(expectedMessage, errorMessage);
         }
 
         [Test]