diff --git a/modules/material-management/src/needs.ts b/modules/material-management/src/needs.ts
index 5c62a662b..b5d310fba 100644
--- a/modules/material-management/src/needs.ts
+++ b/modules/material-management/src/needs.ts
@@ -16,7 +16,7 @@ export function needs(
   condition: any,
   errorMessage: string,
   Err: ErrorConstructor = Error
-) {
+): asserts condition {
   if (!condition) {
     throw new Err(errorMessage)
   }