diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/HaskellHttpClientCodegen.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/HaskellHttpClientCodegen.java
index f1978e172015..561f2f06bbf4 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/HaskellHttpClientCodegen.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/HaskellHttpClientCodegen.java
@@ -881,6 +881,7 @@ private void processReturnType(CodegenOperation op) {
         if (returnType == null || returnType.equals("null")) {
             returnType = "NoContent";
             SetNoContent(op, VENDOR_EXTENSION_X_INLINE_ACCEPT);
+            op.hasProduces = false;
         }
         if (returnType.contains(" ")) {
             returnType = "(" + returnType + ")";