diff --git a/core/execution/input_handler.py b/core/execution/input_handler.py
index b94e9503a..66ef6d0f7 100644
--- a/core/execution/input_handler.py
+++ b/core/execution/input_handler.py
@@ -484,7 +484,10 @@ def _grounding_ocr(target_text: str, anchor_bbox: Optional[Dict] = None) -> Opti
                 all_matches.append({'text': word['text'], 'x': cx, 'y': cy, 'type': 'exact', 'conf': 0.95})
             elif len(word_lower) >= 3 and len(target_lower) >= 3:
                 if target_lower in word_lower or word_lower in target_lower:
-                    all_matches.append({'text': word['text'], 'x': cx, 'y': cy, 'type': 'partial', 'conf': 0.80})
+                    # Pénaliser les matchs partiels trop courts par rapport au target
+                    ratio = len(word_lower) / max(len(target_lower), 1)
+                    conf = 0.80 if ratio > 0.5 else 0.50
+                    all_matches.append({'text': word['text'], 'x': cx, 'y': cy, 'type': 'partial', 'conf': conf})
 
         # Matching lettre initiale manquante
         if not all_matches and len(target_lower) > 3: