diff --git a/packages/algorithms/src/generate_classes/class.ts b/packages/algorithms/src/generate_classes/class.ts
index 07607e83..640ac800 100644
--- a/packages/algorithms/src/generate_classes/class.ts
+++ b/packages/algorithms/src/generate_classes/class.ts
@@ -45,7 +45,7 @@ export default class Class {
 						typeof attribute === "number" ? attribute : attribute.key(),
 					) ?? 0,
 			)
-			.reduce((acc, cur) => acc + cur);
+			.reduce((acc, cur) => acc + cur, 0);
 	}
 
 	/**
diff --git a/packages/algorithms/src/generate_classes/rules/rule.ts b/packages/algorithms/src/generate_classes/rules/rule.ts
index 82992eac..1d91f43d 100644
--- a/packages/algorithms/src/generate_classes/rules/rule.ts
+++ b/packages/algorithms/src/generate_classes/rules/rule.ts
@@ -82,7 +82,7 @@ export abstract class Rule {
 		return entry
 			.students()
 			.map((student) => entry.studentValue(student, this).value)
-			.reduce((acc, cur) => acc + cur);
+			.reduce((acc, cur) => acc + cur, 0);
 	}
 
 	/**