diff --git a/types/bigi/bigi-tests.ts b/types/bigi/bigi-tests.ts
index 0e4822aeb6..23bffb0477 100644
--- a/types/bigi/bigi-tests.ts
+++ b/types/bigi/bigi-tests.ts
@@ -14,3 +14,6 @@ const b6 = b4.multiply(b5);
 
 console.log(b6);
 // => BigInteger { '0': 420, '1': 0, t: 1, s: 0 }
+
+console.log(b1.compareTo(b2));
+// => 70
diff --git a/types/bigi/index.d.ts b/types/bigi/index.d.ts
index 7b44ff75e4..de849587ac 100644
--- a/types/bigi/index.d.ts
+++ b/types/bigi/index.d.ts
@@ -23,7 +23,7 @@ declare class bigi {
     clamp(): void;
     clearBit(n: number): bigi;
     clone(): bigi;
-    compareTo(a: bigi): bigi;
+    compareTo(a: bigi): number;
     copyTo(r: any): void;
     dAddOffset(n: any, w: any): void;
     dMultiply(n: number): void;