diff --git a/libfic/db.go b/libfic/db.go
index 237885ea..93e7d959 100644
--- a/libfic/db.go
+++ b/libfic/db.go
@@ -144,7 +144,7 @@ CREATE TABLE IF NOT EXISTS exercice_files(
   id_exercice INTEGER NOT NULL,
   name VARCHAR(255) NOT NULL,
   cksum BINARY(64) NOT NULL,
-  size INTEGER NOT NULL,
+  size INTEGER UNSIGNED NOT NULL,
   FOREIGN KEY(id_exercice) REFERENCES exercices(id_exercice)
 ) DEFAULT CHARACTER SET = utf8mb4 COLLATE = utf8mb4_unicode_ci;
 `); err != nil {