diff --git a/src/Spectre.Console/Internal/Cell.cs b/src/Spectre.Console/Internal/Cell.cs
index 1a8a0ce..c904757 100644
--- a/src/Spectre.Console/Internal/Cell.cs
+++ b/src/Spectre.Console/Internal/Cell.cs
@@ -8,7 +8,13 @@ namespace Spectre.Console
     {
         public static int GetCellLength(RenderContext context, string text)
         {
-            return text.Sum(rune => GetCellLength(context, rune));
+            var sum = 0;
+            foreach (var rune in text)
+            {
+                sum += GetCellLength(context, rune);
+            }
+
+            return sum;
         }
 
         public static int GetCellLength(RenderContext context, char rune)
diff --git a/src/Spectre.Console/Rendering/Segment.cs b/src/Spectre.Console/Rendering/Segment.cs
index 6b64837..ba6f5ff 100644
--- a/src/Spectre.Console/Rendering/Segment.cs
+++ b/src/Spectre.Console/Rendering/Segment.cs
@@ -135,7 +135,13 @@ namespace Spectre.Console.Rendering
                 throw new ArgumentNullException(nameof(segments));
             }
 
-            return segments.Sum(segment => segment.CellCount(context));
+            var sum = 0;
+            foreach (var segment in segments)
+            {
+                sum += segment.CellCount(context);
+            }
+
+            return sum;
         }
 
         /// <summary>