diff --git a/packages/type-params/src/decode/value/bytes.ts b/packages/type-params/src/decode/value/bytes.ts
index ba29800010..314be1fb7e 100644
--- a/packages/type-params/src/decode/value/bytes.ts
+++ b/packages/type-params/src/decode/value/bytes.ts
@@ -9,9 +9,8 @@ import u8aToBn from '@polkadot/util/u8a/toBn';
 export default function bytes (input: Uint8Array | null): Param$Decoded {
   if (input === null) {
     return {
-      length: 0,
-      value: new Uint8Array()
-    };
+      length: 0
+    } as Param$Decoded;
   }
 
   const length = u8aToBn(input.subarray(0, 4), true).toNumber();
diff --git a/packages/type-params/src/decode/value/code.ts b/packages/type-params/src/decode/value/code.ts
index 6b11039cf0..049272f7bb 100644
--- a/packages/type-params/src/decode/value/code.ts
+++ b/packages/type-params/src/decode/value/code.ts
@@ -9,9 +9,8 @@ import u8aToBn from '@polkadot/util/u8a/toBn';
 export default function code (input: Uint8Array | null): Param$Decoded {
   if (input === null) {
     return {
-      length: 0,
-      value: new Uint8Array()
-    };
+      length: 0
+    } as Param$Decoded;
   }
 
   const length = u8aToBn(input.subarray(0, 4), true).toNumber() + 4;
diff --git a/packages/type-params/src/decode/value/string.ts b/packages/type-params/src/decode/value/string.ts
index 9aace790dc..23b1d73d6c 100644
--- a/packages/type-params/src/decode/value/string.ts
+++ b/packages/type-params/src/decode/value/string.ts
@@ -10,9 +10,8 @@ import u8aToUtf8 from '@polkadot/util/u8a/toUtf8';
 export default function string (input: Uint8Array | null): Param$Decoded {
   if (input === null) {
     return {
-      length: 0,
-      value: ''
-    };
+      length: 0
+    } as Param$Decoded;
   }
 
   const length = u8aToBn(input.subarray(0, 4), true).toNumber();
diff --git a/packages/type-params/src/decode/value/u8a.ts b/packages/type-params/src/decode/value/u8a.ts
index d094df6dc2..7ea561dd35 100644
--- a/packages/type-params/src/decode/value/u8a.ts
+++ b/packages/type-params/src/decode/value/u8a.ts
@@ -7,9 +7,8 @@ import { Param$Decoded } from '../../types';
 export default function u8a (input: Uint8Array | null, bitLength: 256 | 512, offset: number): Param$Decoded {
   if (input === null) {
     return {
-      length: 0,
-      value: new Uint8Array()
-    };
+      length: 0
+    } as Param$Decoded;
   }
 
   const length = (bitLength / 8) + offset;