diff --git a/types/web3/utils.d.ts b/types/web3/utils.d.ts
index fa73791615..c9dc3c863d 100644
--- a/types/web3/utils.d.ts
+++ b/types/web3/utils.d.ts
@@ -61,8 +61,7 @@ export default interface Utils {
     fromAscii(val: string): string;
     fromDecimal(val: string | number | BigNumber): string;
     fromUtf8(val: string): string;
-    fromWei(val: BigNumber, unit?: Unit): BigNumber;
-    fromWei(val: string | number, unit?: Unit): string;
+    fromWei(val: string | number | BigNumber, unit?: Unit): string;
     hexToBytes(val: string): number[];
     hexToNumber(val: string | number | BigNumber): number;
     hexToNumberString(val: string | number | BigNumber): string;
diff --git a/types/web3/web3-tests.ts b/types/web3/web3-tests.ts
index d2c3c92302..e13c0a9254 100644
--- a/types/web3/web3-tests.ts
+++ b/types/web3/web3-tests.ts
@@ -165,8 +165,8 @@ const weiStr: string = web3.utils.toWei("100", "gwei");
 const weiBn: BigNumber = web3.utils.toWei(web3.utils.toBN("1"));
 const rndHex: string = Web3.utils.randomHex(10);
 const sha3: string = web3.utils.soliditySha3(0, 1, "abc");
-const fromWei1: BigNumber = web3.utils.fromWei(new BigNumber(1));
-const fromWei2: BigNumber = web3.utils.fromWei(new BigNumber(1), "gwei");
+const fromWei1: string = web3.utils.fromWei(new BigNumber(1));
+const fromWei2: string = web3.utils.fromWei(new BigNumber(1), "gwei");
 const fromWei3: string = web3.utils.fromWei("1");
 const fromWei4: string = web3.utils.fromWei("1", "gwei");
 const fromWei5: string = web3.utils.fromWei(1);