diff --git a/smithy-typescript-codegen/src/main/java/software/amazon/smithy/typescript/codegen/integration/HttpBindingProtocolGenerator.java b/smithy-typescript-codegen/src/main/java/software/amazon/smithy/typescript/codegen/integration/HttpBindingProtocolGenerator.java
index fab8e968606..703d3e58012 100644
--- a/smithy-typescript-codegen/src/main/java/software/amazon/smithy/typescript/codegen/integration/HttpBindingProtocolGenerator.java
+++ b/smithy-typescript-codegen/src/main/java/software/amazon/smithy/typescript/codegen/integration/HttpBindingProtocolGenerator.java
@@ -1865,7 +1865,7 @@ private void handleContentType(
                 + ".find(key => key.toLowerCase() === 'content-type');");
         writer.openBlock("if (contentTypeHeaderKey != null) {", "};", () -> {
             writer.write("const contentType = output.headers[contentTypeHeaderKey];");
-            if (optionalContentType.isPresent() || operation.getInput().isPresent()) {
+            if (optionalContentType.isPresent() || HttpBindingIndex.of(context.getModel()).hasRequestBody(operation)) {
                 String contentType = optionalContentType.orElse(getDocumentContentType());
                 // If the operation accepts a content type, it must be either unset or the expected value.
                 writer.openBlock("if (contentType !== undefined && contentType !== $S) {", "};", contentType, () -> {