diff --git a/codegen/smithy-go-codegen/src/main/java/software/amazon/smithy/go/codegen/GoStdlibTypes.java b/codegen/smithy-go-codegen/src/main/java/software/amazon/smithy/go/codegen/GoStdlibTypes.java
index 2b642c10..57ef3048 100644
--- a/codegen/smithy-go-codegen/src/main/java/software/amazon/smithy/go/codegen/GoStdlibTypes.java
+++ b/codegen/smithy-go-codegen/src/main/java/software/amazon/smithy/go/codegen/GoStdlibTypes.java
@@ -35,6 +35,7 @@ public static final class Context {
 
     public static final class Time {
         public static final Symbol Time = SmithyGoDependency.TIME.pointableSymbol("Time");
+        public static final Symbol Duration = SmithyGoDependency.TIME.valueSymbol("Duration");
     }
 
     public static final class Encoding {