diff --git a/Design/Rule0026ToolTipPunctuation.cs b/Design/Rule0026ToolTipPunctuation.cs
index 37f33867..e4db7124 100644
--- a/Design/Rule0026ToolTipPunctuation.cs
+++ b/Design/Rule0026ToolTipPunctuation.cs
@@ -31,8 +31,8 @@ private void AnalyzeToolTipPunctuation(SyntaxNodeAnalysisContext ctx)
             if (tooltipLabel.Value.ToString().Contains("\\"))
                 ctx.ReportDiagnostic(Diagnostic.Create(DiagnosticDescriptors.Rule0026ToolTipDoNotUseLineBreaks, tooltipProperty.GetLocation()));
 
-            if (((IControlSymbol)ctx.ContainingSymbol).ControlKind == ControlKind.Field)
-                if (!tooltipLabel.Value.ToString().StartsWith("Specifies"))
+            if (ctx.ContainingSymbol.Kind == SymbolKind.Control && ((IControlSymbol)ctx.ContainingSymbol).ControlKind == ControlKind.Field)
+                if (!tooltipLabel.Value.ToString().StartsWith("'Specifies"))
                     ctx.ReportDiagnostic(Diagnostic.Create(DiagnosticDescriptors.Rule0026ToolTipShouldStartWithSpecifies, tooltipProperty.GetLocation()));
         }
     }