diff --git a/src/Microsoft.PowerShell.ConsoleHost/host/msh/ConsoleHostUserInterfacePrompt.cs b/src/Microsoft.PowerShell.ConsoleHost/host/msh/ConsoleHostUserInterfacePrompt.cs
index 49ed23a2a69..58cd171cd2f 100644
--- a/src/Microsoft.PowerShell.ConsoleHost/host/msh/ConsoleHostUserInterfacePrompt.cs
+++ b/src/Microsoft.PowerShell.ConsoleHost/host/msh/ConsoleHostUserInterfacePrompt.cs
@@ -202,7 +202,7 @@ public override
 
                         while (true)
                         {
-                            fieldPromptList.AppendFormat(CultureInfo.InvariantCulture, $"{inputList.Count}]: ");
+                            fieldPromptList.Append(CultureInfo.InvariantCulture, $"{inputList.Count}]: ");
                             bool endListInput = false;
                             object convertedObj = null;
                             _ = PromptForSingleItem(
diff --git a/src/Microsoft.PowerShell.ConsoleHost/host/msh/ConsoleHostUserInterfacePromptForChoice.cs b/src/Microsoft.PowerShell.ConsoleHost/host/msh/ConsoleHostUserInterfacePromptForChoice.cs
index e900a0fc2f7..fa470b245a2 100644
--- a/src/Microsoft.PowerShell.ConsoleHost/host/msh/ConsoleHostUserInterfacePromptForChoice.cs
+++ b/src/Microsoft.PowerShell.ConsoleHost/host/msh/ConsoleHostUserInterfacePromptForChoice.cs
@@ -345,7 +345,7 @@ private void WriteChoicePrompt(string[,] hotkeysAndPlainLabels,
                         defaultStr = hotkeysAndPlainLabels[1, defaultChoice];
                     }
 
-                    defaultChoicesBuilder.AppendFormat(CultureInfo.InvariantCulture, $"{prepend}{defaultStr}");
+                    defaultChoicesBuilder.Append(CultureInfo.InvariantCulture, $"{prepend}{defaultStr}");
                     prepend = ",";
                 }
 
diff --git a/src/System.Management.Automation/engine/hostifaces/InternalHostUserInterface.cs b/src/System.Management.Automation/engine/hostifaces/InternalHostUserInterface.cs
index d398e8e006f..48066da71fa 100644
--- a/src/System.Management.Automation/engine/hostifaces/InternalHostUserInterface.cs
+++ b/src/System.Management.Automation/engine/hostifaces/InternalHostUserInterface.cs
@@ -927,7 +927,7 @@ private Collection<int> EmulatePromptForMultipleChoice(string caption,
                         defaultStr = hotkeysAndPlainLabels[1, defaultChoice];
                     }
 
-                    defaultChoicesBuilder.AppendFormat(Globalization.CultureInfo.InvariantCulture, $"{prepend}{defaultStr}");
+                    defaultChoicesBuilder.Append(Globalization.CultureInfo.InvariantCulture, $"{prepend}{defaultStr}");
                     prepend = ",";
                 }