diff --git a/packages/abi/src.ts/interface.ts b/packages/abi/src.ts/interface.ts
index af80974aee..ce1fbd2063 100644
--- a/packages/abi/src.ts/interface.ts
+++ b/packages/abi/src.ts/interface.ts
@@ -462,6 +462,14 @@ export class Interface {
                  return keccak256(hexlify(value));
             }
 
+            if (param.type === "bool" && typeof(value) === "boolean") {
+                value = (value ? "0x01": "0x00");
+            }
+
+            if (param.type.match(/^u?int/)) {
+                value = BigNumber.from(value).toHexString();
+            }
+
             // Check addresses are valid
             if (param.type === "address") { this._abiCoder.encode( [ "address" ], [ value ]); }
             return hexZeroPad(hexlify(value), 32);