diff --git a/dist/screeps.d.ts b/dist/screeps.d.ts
index 4fb0dbf..15eb45e 100644
--- a/dist/screeps.d.ts
+++ b/dist/screeps.d.ts
@@ -819,7 +819,7 @@ interface SignDefinition {
 }
 interface StoreDefinition {
     [resource: string]: number | undefined;
-    energy?: number;
+    energy: number;
     power?: number;
 }
 interface LookAtResultWithPos {
diff --git a/src/helpers.ts b/src/helpers.ts
index dc7cc53..9bbba16 100644
--- a/src/helpers.ts
+++ b/src/helpers.ts
@@ -47,7 +47,7 @@ interface SignDefinition {
 }
 interface StoreDefinition {
     [resource: string]: number | undefined;
-    energy?: number;
+    energy: number;
     power?: number;
 }