diff --git a/klausur-service/backend/cv_cell_grid.py b/klausur-service/backend/cv_cell_grid.py
index 6e55509..6480884 100644
--- a/klausur-service/backend/cv_cell_grid.py
+++ b/klausur-service/backend/cv_cell_grid.py
@@ -39,6 +39,8 @@ try:
 except ImportError:
     Image = None  # type: ignore[assignment,misc]
 
+# Minimum OCR word confidence to keep (used across multiple functions)
+_MIN_WORD_CONF = 30
 
 # ---------------------------------------------------------------------------
 
@@ -186,7 +188,6 @@ def _ocr_cell_crop(
             words = []
 
     # Filter low-confidence words
-    _MIN_WORD_CONF = 30
     if words:
         words = [w for w in words if w.get('conf', 0) >= _MIN_WORD_CONF]
 
@@ -652,7 +653,6 @@ def _ocr_single_cell(
     # Filter low-confidence words (OCR noise from images/artifacts).
     # Tesseract gives low confidence to misread image edges, borders,
     # and other non-text elements.
-    _MIN_WORD_CONF = 30
     if words:
         words = [w for w in words if w.get('conf', 0) >= _MIN_WORD_CONF]