diff --git a/src/Umbraco.Core/Persistence/Migrations/Upgrades/TargetVersionSevenFourteenZero/UpdateMemberGroupPickerData.cs b/src/Umbraco.Core/Persistence/Migrations/Upgrades/TargetVersionSevenFourteenZero/UpdateMemberGroupPickerData.cs
new file mode 100644
index 0000000000..2dbc69e58a
--- /dev/null
+++ b/src/Umbraco.Core/Persistence/Migrations/Upgrades/TargetVersionSevenFourteenZero/UpdateMemberGroupPickerData.cs
@@ -0,0 +1,36 @@
+using Umbraco.Core.Logging;
+using Umbraco.Core.Persistence.SqlSyntax;
+
+namespace Umbraco.Core.Persistence.Migrations.Upgrades.TargetVersionSevenFourteenZero
+{
+    /// <summary>
+    /// Migrates member group picker properties from NVarchar to NText. See https://github.com/umbraco/Umbraco-CMS/issues/3268.
+    /// </summary>
+    [Migration("7.14.0", 1, Constants.System.UmbracoMigrationName)]
+    public class UpdateMemberGroupPickerData : MigrationBase
+    {
+        public UpdateMemberGroupPickerData(ISqlSyntaxProvider sqlSyntax, ILogger logger) : base(sqlSyntax, logger)
+        {
+        }
+
+        public override void Up()
+        {
+            // move the data for all member group properties from the NVarchar to the NText column and clear the NVarchar column
+            Execute.Sql(@"UPDATE cmsPropertyData SET dataNtext = dataNvarchar, dataNvarchar = NULL
+                WHERE dataNtext IS NULL AND id IN (
+	                SELECT id FROM cmsPropertyData WHERE propertyTypeId in (
+		                SELECT id from cmsPropertyType where dataTypeID IN (
+			                SELECT nodeId FROM cmsDataType WHERE propertyEditorAlias = 'Umbraco.MemberGroupPicker'
+		                )
+	                )
+                )");
+
+            // ensure that all exising member group properties are defined as NText
+            Execute.Sql("UPDATE cmsDataType SET dbType = 'Ntext' WHERE propertyEditorAlias = 'Umbraco.MemberGroupPicker'");
+        }
+
+        public override void Down()
+        {
+        }
+    }
+}
diff --git a/src/Umbraco.Core/Umbraco.Core.csproj b/src/Umbraco.Core/Umbraco.Core.csproj
index c7393e524f..8ee29e777f 100644
--- a/src/Umbraco.Core/Umbraco.Core.csproj
+++ b/src/Umbraco.Core/Umbraco.Core.csproj
@@ -572,6 +572,7 @@
     <Compile Include="Persistence\Migrations\Upgrades\TargetVersionSevenEightZero\AddInstructionCountColumn.cs" />
     <Compile Include="Persistence\Migrations\Upgrades\TargetVersionSevenEightZero\AddCmsMediaTable.cs" />
     <Compile Include="Persistence\Migrations\Upgrades\TargetVersionSevenEightZero\AddUserLoginTable.cs" />
+    <Compile Include="Persistence\Migrations\Upgrades\TargetVersionSevenFourteenZero\UpdateMemberGroupPickerData.cs" />
     <Compile Include="Persistence\Migrations\Upgrades\TargetVersionSevenTwelveZero\RenameTrueFalseField.cs" />
     <Compile Include="Persistence\Migrations\Upgrades\TargetVersionSevenTwelveZero\SetDefaultTagsStorageType.cs" />
     <Compile Include="Persistence\Migrations\Upgrades\TargetVersionSevenNineZero\AddUmbracoAuditTable.cs" />
diff --git a/src/Umbraco.Web/PropertyEditors/MemberGroupPickerPropertyEditor.cs b/src/Umbraco.Web/PropertyEditors/MemberGroupPickerPropertyEditor.cs
index 433199c536..6d7dd9e344 100644
--- a/src/Umbraco.Web/PropertyEditors/MemberGroupPickerPropertyEditor.cs
+++ b/src/Umbraco.Web/PropertyEditors/MemberGroupPickerPropertyEditor.cs
@@ -8,7 +8,7 @@ using Umbraco.Core.PropertyEditors;
 
 namespace Umbraco.Web.PropertyEditors
 {
-     [PropertyEditor(Constants.PropertyEditors.MemberGroupPickerAlias, "Member Group Picker", "membergrouppicker", Group="People", Icon="icon-users")]
+    [PropertyEditor(Constants.PropertyEditors.MemberGroupPickerAlias, "Member Group Picker", PropertyEditorValueTypes.Text, "membergrouppicker", Group="People", Icon="icon-users")]
     public class MemberGroupPickerPropertyEditor : PropertyEditor
     {
     }