diff --git a/src/NameBadgeAutomater/Services/NameParserService.cs b/src/NameBadgeAutomater/Services/NameParserService.cs
index 70979e8..131c33b 100644
--- a/src/NameBadgeAutomater/Services/NameParserService.cs
+++ b/src/NameBadgeAutomater/Services/NameParserService.cs
@@ -24,7 +24,7 @@ public List<Person> ParseRawNames(string rawNames)
       .ToList();
   }
 
-  public Person? ParseRawName(string rawName)
+  public Person? ParseRawName(string? rawName)
   {
     if (string.IsNullOrWhiteSpace(rawName)) return null; // No name.
 
diff --git a/tests/NameBadgeAutomater.Tests/Services/NameParserServiceTests.cs b/tests/NameBadgeAutomater.Tests/Services/NameParserServiceTests.cs
index 6cf073e..8e83b08 100644
--- a/tests/NameBadgeAutomater.Tests/Services/NameParserServiceTests.cs
+++ b/tests/NameBadgeAutomater.Tests/Services/NameParserServiceTests.cs
@@ -34,7 +34,7 @@ public void ParseRawName_ShouldReturnCorrectNames(string rawName, string firstNa
     [InlineData(null)]
     [InlineData("")]
     [InlineData(" ")]
-    public void ParseRawName_ShouldReturnNull_WhenEmptyValue(string rawName)
+    public void ParseRawName_ShouldReturnNull_WhenEmptyValue(string? rawName)
     {
         //Arrange
         var sut = new NameParserService();