2 files changed, 2 insertions, 2 deletions
diff --git a/packages/utils/src/abi_decoder.ts b/packages/utils/src/abi_decoder.ts
index 28b6418d8..2da46db35 100644
--- a/packages/utils/src/abi_decoder.ts
+++ b/packages/utils/src/abi_decoder.ts
@@ -69,7 +69,7 @@ export class AbiDecoder {
             }
             if (param.type === SolidityTypes.Address) {
                 const baseHex = 16;
-                value = addressUtils.padZeros(new BigNumber((value as string).toLowerCase()).toString(baseHex));
+                value = addressUtils.padZeros(new BigNumber(value).toString(baseHex));
             } else if (param.type === SolidityTypes.Uint256 || param.type === SolidityTypes.Uint) {
                 value = new BigNumber(value);
             } else if (param.type === SolidityTypes.Uint8) {
diff --git a/packages/utils/src/abi_encoder/utils/math.ts b/packages/utils/src/abi_encoder/utils/math.ts
index dd45ea05c..a2a79e2a8 100644
--- a/packages/utils/src/abi_encoder/utils/math.ts
+++ b/packages/utils/src/abi_encoder/utils/math.ts
@@ -14,7 +14,7 @@ function sanityCheckBigNumberRange(
         throw new Error(`Tried to assign value of ${value}, which exceeds max value of ${maxValue}`);
     } else if (value.isLessThan(minValue)) {
         throw new Error(`Tried to assign value of ${value}, which exceeds min value of ${minValue}`);
-    } else if (value.isNaN) {
+    } else if (value.isNaN()) {
         throw new Error(`Tried to assign NaN value`);
     }
 }