diff --git a/lib/store-db.ts b/lib/store-db.ts
index b0b32c6..25589c3 100644
--- a/lib/store-db.ts
+++ b/lib/store-db.ts
@@ -141,8 +141,19 @@ export function autoCategorize(description: string, categories: Category[]): str
 
   for (const category of categories) {
     for (const keyword of category.keywords) {
-      if (lowerDesc.includes(keyword.toLowerCase())) {
-        return category.id
+      const lowerKeyword = keyword.toLowerCase()
+      
+      // Pour les keywords courts (< 4 chars), matcher uniquement des mots entiers
+      if (lowerKeyword.length < 4) {
+        const wordBoundary = new RegExp(`\\b${lowerKeyword}\\b`)
+        if (wordBoundary.test(lowerDesc)) {
+          return category.id
+        }
+      } else {
+        // Pour les keywords plus longs, includes() suffit
+        if (lowerDesc.includes(lowerKeyword)) {
+          return category.id
+        }
       }
     }
   }