diff --git a/types/Weapon.d.ts b/types/Weapon.d.ts
index 9ec3d57a..d26caa7d 100644
--- a/types/Weapon.d.ts
+++ b/types/Weapon.d.ts
@@ -7,7 +7,7 @@ interface Weapon {
     proficiency: number
     max_level: number
     max_skill_level: number
-    series?: number
+    series: number
     ax: number
     name: { 
         en: string