diff --git a/test_unstructured/partition/pdf_image/test_ocr.py b/test_unstructured/partition/pdf_image/test_ocr.py
index 4ab2ce173a..6f13d3dd10 100644
--- a/test_unstructured/partition/pdf_image/test_ocr.py
+++ b/test_unstructured/partition/pdf_image/test_ocr.py
@@ -142,7 +142,7 @@ def test_get_ocr_layout_from_image_tesseract_filters_predictions_below_confidenc
             },
         ),
     )
-    monkeypatch.setenv("TESSERACT_CONFIDENCE_THRESHOLD", confidence_threshold)
+    monkeypatch.setenv("TESSERACT_CONFIDENCE_THRESHOLD", str(confidence_threshold))
 
     image = Image.new("RGB", (100, 100))