diff --git a/codegen/smithy-aws-kotlin-codegen/src/main/kotlin/aws/sdk/kotlin/codegen/protocols/RestXml.kt b/codegen/smithy-aws-kotlin-codegen/src/main/kotlin/aws/sdk/kotlin/codegen/protocols/RestXml.kt
index 7d38aeeeb36..e14443dd118 100644
--- a/codegen/smithy-aws-kotlin-codegen/src/main/kotlin/aws/sdk/kotlin/codegen/protocols/RestXml.kt
+++ b/codegen/smithy-aws-kotlin-codegen/src/main/kotlin/aws/sdk/kotlin/codegen/protocols/RestXml.kt
@@ -62,13 +62,13 @@ class RestXmlParserGenerator(
         writer: KotlinWriter
     ): XmlSerdeDescriptorGenerator = RestXmlSerdeDescriptorGenerator(ctx.toRenderingContext(protocolGenerator, shape, writer), members)
 
-    override fun payloadDeserializer(ctx: ProtocolGenerator.GenerationContext, member: MemberShape): Symbol {
-        return if (member.hasTrait<XmlNameTrait>()) {
+    override fun payloadDeserializer(ctx: ProtocolGenerator.GenerationContext, shape: Shape): Symbol {
+        return if (shape.hasTrait<XmlNameTrait>() && shape is MemberShape) {
             // can't delegate, have to generate a dedicated deserializer because the member xml name is different
             // from the name of the target shape
-            explicitBoundStructureDeserializer(ctx, member)
+            explicitBoundStructureDeserializer(ctx, shape)
         } else {
-            super.payloadDeserializer(ctx, member)
+            super.payloadDeserializer(ctx, shape)
         }
     }
 
@@ -116,13 +116,13 @@ class RestXmlSerializerGenerator(
         writer: KotlinWriter
     ): XmlSerdeDescriptorGenerator = RestXmlSerdeDescriptorGenerator(ctx.toRenderingContext(protocolGenerator, shape, writer), members)
 
-    override fun payloadSerializer(ctx: ProtocolGenerator.GenerationContext, member: MemberShape): Symbol {
-        return if (member.hasTrait<XmlNameTrait>()) {
+    override fun payloadSerializer(ctx: ProtocolGenerator.GenerationContext, shape: Shape): Symbol {
+        return if (shape.hasTrait<XmlNameTrait>() && shape is MemberShape) {
             // can't delegate, have to generate a dedicated serializer because the member xml name is different
             // from the name of the target shape
-            explicitBoundStructureSerializer(ctx, member)
+            explicitBoundStructureSerializer(ctx, shape)
         } else {
-            super.payloadSerializer(ctx, member)
+            super.payloadSerializer(ctx, shape)
         }
     }
 
diff --git a/codegen/smithy-aws-kotlin-codegen/src/main/kotlin/aws/sdk/kotlin/codegen/protocols/core/QueryHttpBindingProtocolGenerator.kt b/codegen/smithy-aws-kotlin-codegen/src/main/kotlin/aws/sdk/kotlin/codegen/protocols/core/QueryHttpBindingProtocolGenerator.kt
index b77e6f422eb..02805326b28 100644
--- a/codegen/smithy-aws-kotlin-codegen/src/main/kotlin/aws/sdk/kotlin/codegen/protocols/core/QueryHttpBindingProtocolGenerator.kt
+++ b/codegen/smithy-aws-kotlin-codegen/src/main/kotlin/aws/sdk/kotlin/codegen/protocols/core/QueryHttpBindingProtocolGenerator.kt
@@ -7,6 +7,7 @@ import software.amazon.smithy.kotlin.codegen.core.RuntimeTypes
 import software.amazon.smithy.kotlin.codegen.core.withBlock
 import software.amazon.smithy.kotlin.codegen.model.expectShape
 import software.amazon.smithy.kotlin.codegen.model.knowledge.SerdeIndex
+import software.amazon.smithy.kotlin.codegen.model.targetOrSelf
 import software.amazon.smithy.kotlin.codegen.rendering.protocol.HttpBindingResolver
 import software.amazon.smithy.kotlin.codegen.rendering.protocol.ProtocolGenerator
 import software.amazon.smithy.kotlin.codegen.rendering.protocol.ProtocolMiddleware
@@ -158,10 +159,10 @@ abstract class AbstractQueryFormUrlSerializerGenerator(
         }
     }
 
-    override fun payloadSerializer(ctx: ProtocolGenerator.GenerationContext, member: MemberShape): Symbol {
+    override fun payloadSerializer(ctx: ProtocolGenerator.GenerationContext, shape: Shape): Symbol {
         // re-use document serializer (for the target shape!)
-        val target = ctx.model.expectShape(member.target)
-        val symbol = ctx.symbolProvider.toSymbol(member)
+        val target = shape.targetOrSelf(ctx.model)
+        val symbol = ctx.symbolProvider.toSymbol(shape)
         val serializeFn = documentSerializer(ctx, target)
         val fnName = symbol.payloadSerializerName()
         return symbol.payloadSerializer(ctx.settings) { writer ->
diff --git a/codegen/smithy-aws-kotlin-codegen/src/test/kotlin/aws/sdk/kotlin/codegen/protocols/core/AwsHttpBindingProtocolGeneratorTest.kt b/codegen/smithy-aws-kotlin-codegen/src/test/kotlin/aws/sdk/kotlin/codegen/protocols/core/AwsHttpBindingProtocolGeneratorTest.kt
index 36540a8727f..68d95ac4480 100644
--- a/codegen/smithy-aws-kotlin-codegen/src/test/kotlin/aws/sdk/kotlin/codegen/protocols/core/AwsHttpBindingProtocolGeneratorTest.kt
+++ b/codegen/smithy-aws-kotlin-codegen/src/test/kotlin/aws/sdk/kotlin/codegen/protocols/core/AwsHttpBindingProtocolGeneratorTest.kt
@@ -101,7 +101,7 @@ class AwsHttpBindingProtocolGeneratorTest {
                     error("Unneeded for test")
                 }
 
-                override fun payloadDeserializer(ctx: ProtocolGenerator.GenerationContext, member: MemberShape): Symbol {
+                override fun payloadDeserializer(ctx: ProtocolGenerator.GenerationContext, shape: Shape): Symbol {
                     error("Unneeded for test")
                 }
             }
@@ -112,7 +112,7 @@ class AwsHttpBindingProtocolGeneratorTest {
                     error("Unneeded for test")
                 }
 
-                override fun payloadSerializer(ctx: ProtocolGenerator.GenerationContext, member: MemberShape): Symbol {
+                override fun payloadSerializer(ctx: ProtocolGenerator.GenerationContext, shape: Shape): Symbol {
                     error("Unneeded for test")
                 }
             }