diff --git a/src/Microsoft.ComponentDetection.Common/PatternMatchingUtility.cs b/src/Microsoft.ComponentDetection.Common/PatternMatchingUtility.cs
index dc6cda863..43d932f13 100644
--- a/src/Microsoft.ComponentDetection.Common/PatternMatchingUtility.cs
+++ b/src/Microsoft.ComponentDetection.Common/PatternMatchingUtility.cs
@@ -61,7 +61,7 @@ public sealed class CompiledMatcher
         private readonly string[] patterns;
 
         public CompiledMatcher(IEnumerable<string> patterns)
-            : this(patterns is string[] arr ? arr : (patterns ?? throw new ArgumentNullException(nameof(patterns))).ToArray())
+            : this(ToArray(patterns))
         {
         }
 
@@ -72,6 +72,12 @@ internal CompiledMatcher(string[] patterns)
             ValidatePatternElements(this.patterns);
         }
 
+        private static string[] ToArray(IEnumerable<string> patterns)
+        {
+            ArgumentNullException.ThrowIfNull(patterns);
+            return patterns as string[] ?? patterns.ToArray();
+        }
+
         public bool IsMatch(ReadOnlySpan<char> fileName) => GetFirstMatchingPattern(fileName, this.patterns) is not null;
 
         /// <summary>