diff --git a/Clippit/PowerPoint/FluentPresentationBuilder.cs b/Clippit/PowerPoint/FluentPresentationBuilder.cs
index 37dde975..91b8779a 100644
--- a/Clippit/PowerPoint/FluentPresentationBuilder.cs
+++ b/Clippit/PowerPoint/FluentPresentationBuilder.cs
@@ -625,7 +625,8 @@ private void CopyRelatedPartsForContentParts(OpenXmlPart oldContentPart, OpenXml
                 if (newContentPart.HasRelationship(relId))
                     continue;
 
-                if (oldContentPart.Parts.FirstOrDefault(p => p.RelationshipId == relId) is {} oldPartIdPair)
+                var oldPartIdPair = oldContentPart.Parts.FirstOrDefault(p => p.RelationshipId == relId);
+                if (oldPartIdPair != default)
                 {
                     var oldPart = oldPartIdPair.OpenXmlPart;
                     OpenXmlPart newPart = null;
@@ -751,7 +752,7 @@ private void CopyRelatedPartsForContentParts(OpenXmlPart oldContentPart, OpenXml
                     continue;
 
                 var oldPartIdPair9 = oldContentPart.Parts.FirstOrDefault(p => p.RelationshipId == relId);
-                if (oldPartIdPair9 is {})
+                if (oldPartIdPair9 != default)
                 {
                     var newPart = _newDocument.PresentationPart.AddCustomXmlPart(CustomXmlPartType.CustomXml);
                     using (var stream = oldPartIdPair9.OpenXmlPart.GetStream())
diff --git a/Clippit/PowerPoint/PresentationBuilderTools.cs b/Clippit/PowerPoint/PresentationBuilderTools.cs
index 9c7e9dda..faf8f72c 100644
--- a/Clippit/PowerPoint/PresentationBuilderTools.cs
+++ b/Clippit/PowerPoint/PresentationBuilderTools.cs
@@ -106,7 +106,8 @@ internal static void CopyChartObjects(ChartPart oldChart, ChartPart newChart)
             {
                 var relId = dataReference.Attribute(R.id).Value;
 
-                if (oldChart.Parts.FirstOrDefault(p => p.RelationshipId == relId) is {} oldPartIdPair)
+                var oldPartIdPair = oldChart.Parts.FirstOrDefault(p => p.RelationshipId == relId);
+                if (oldPartIdPair != default)
                 {
                     switch (oldPartIdPair.OpenXmlPart)
                     {
@@ -196,7 +197,8 @@ internal static void CopyExtendedChartObjects(ExtendedChartPart oldChart, Extend
             {
                 var relId = dataReference.Attribute(R.id).Value;
 
-                if (oldChart.Parts.FirstOrDefault(p => p.RelationshipId == relId) is {} oldPartIdPair)
+                var oldPartIdPair = oldChart.Parts.FirstOrDefault(p => p.RelationshipId == relId);
+                if (oldPartIdPair != default)
                 {
                     switch (oldPartIdPair.OpenXmlPart)
                     {