diff --git a/M6502/M6502.Symbols/IdentifiableSection.cs b/M6502/M6502.Symbols/IdentifiableSection.cs
index 925fd30..f128b9c 100644
--- a/M6502/M6502.Symbols/IdentifiableSection.cs
+++ b/M6502/M6502.Symbols/IdentifiableSection.cs
@@ -1,5 +1,6 @@
 namespace M6502.Symbols
 {
+    using System.Collections;
     using System.Diagnostics;
 
     public class IdentifiableSection : Section