diff --git a/docker/Dockerfile.backend b/docker/Dockerfile.backend
index 4b8ceebb..7bd02348 100644
--- a/docker/Dockerfile.backend
+++ b/docker/Dockerfile.backend
@@ -48,7 +48,7 @@ RUN go mod download
 
 COPY . .
 RUN CGO_ENABLED=1 GOOS=linux \
-·
+    CGO_CFLAGS="-D_LARGEFILE64_SOURCE" \
     go build -trimpath -ldflags="-s -w" -o nofx .
 
 # ──────────────────────────────────────────────────────────────