diff --git a/src/hooks/useImages.ts b/src/hooks/useImages.ts
index 877e3ed..6aaea5d 100644
--- a/src/hooks/useImages.ts
+++ b/src/hooks/useImages.ts
@@ -48,7 +48,9 @@ function reducer(state: ImageItem[], action: Action): ImageItem[] {
 
 function refFromFilename(filename: string): string {
   const dot = filename.lastIndexOf('.')
-  return dot === -1 ? filename : filename.slice(0, dot)
+  const base = dot === -1 ? filename : filename.slice(0, dot)
+  // Supprime les tirets/espaces/underscores en fin de nom (ex: "26774-" → "26774")
+  return base.replace(/[-_\s]+$/, '')
 }
 
 function blobToBase64(blob: Blob): Promise<string> {