diff --git a/src/ocrmypdf/_options.py b/src/ocrmypdf/_options.py
index 7df6e696..e7e44d4f 100644
--- a/src/ocrmypdf/_options.py
+++ b/src/ocrmypdf/_options.py
@@ -78,6 +78,7 @@ class OCROptions(BaseModel):
     output_file: PathOrIO
     sidecar: PathOrIO | None = None
     output_folder: Path | None = None
+    work_folder: Path | None = None
 
     # Core OCR options
     languages: list[str] = Field(default_factory=lambda: [DEFAULT_LANGUAGE])
diff --git a/src/ocrmypdf/api.py b/src/ocrmypdf/api.py
index 482367a7..d4680a76 100644
--- a/src/ocrmypdf/api.py
+++ b/src/ocrmypdf/api.py
@@ -477,8 +477,11 @@ def _pdf_to_hocr(  # noqa: D417
     # Remove None values to let OCROptions use its defaults
     options_kwargs = {k: v for k, v in options_kwargs.items() if v is not None}
 
+    # Add output_folder to options_kwargs since it's now a proper field
+    options_kwargs['output_folder'] = output_folder
+
     # Remove any kwargs that aren't OCROptions fields and store in extra_attrs
-    extra_attrs = {'output_folder': output_folder}
+    extra_attrs = {}
     ocr_fields = set(OCROptions.model_fields.keys())
     known_extra = {'progress_bar', 'plugins'}
 
@@ -573,8 +576,11 @@ def _hocr_to_ocr_pdf(  # noqa: D417
     # Remove None values to let OCROptions use its defaults
     options_kwargs = {k: v for k, v in options_kwargs.items() if v is not None}
 
+    # Add work_folder to options_kwargs since it's now a proper field
+    options_kwargs['work_folder'] = work_folder
+
     # Remove any kwargs that aren't OCROptions fields and store in extra_attrs
-    extra_attrs = {'work_folder': work_folder}
+    extra_attrs = {}
     ocr_fields = set(OCROptions.model_fields.keys())
     known_extra = {'progress_bar', 'plugins'}