diff --git a/index.d.ts b/index.d.ts
index 2a3dee7..b005753 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -1,9 +1,9 @@
 export type SIGNAL = "SIGSEGV" | string;
 
-export type CrashCallback = (signal: SIGNAL, address: string, stack: string[]) => any;
+export type CrashCallback = (signal: SIGNAL, address: string, stack: string[]) => void;
 
 export function registerHandler(): void;
 export function registerHandler(file: string): void;
 export function registerHandler(file: string, callback: CrashCallback): void;
 
-export function causeSegfault(): void;
\ No newline at end of file
+export function causeSegfault(): void;