diff --git a/rpc/types.go b/rpc/types.go
index 28395a5125..f2031a883a 100644
--- a/rpc/types.go
+++ b/rpc/types.go
@@ -107,7 +107,7 @@ func (bn *BlockNumber) UnmarshalJSON(data []byte) error {
 	if hexutil.IsValidHexString(input) {
 		blckNum, err = hexutil.DecodeUint64(input)
 	} else {
-		//Try converting input directly into uint64 value
+		//Else try converting input directly into uint64 value
 		blckNum, err = strconv.ParseUint(input, 10, 64)
 	}
 
diff --git a/rpc/types_test.go b/rpc/types_test.go
index 2a895886b8..8ff021578f 100644
--- a/rpc/types_test.go
+++ b/rpc/types_test.go
@@ -42,16 +42,17 @@ func TestBlockNumberJSONUnmarshal(t *testing.T) {
 		6:  {`"0x12"`, false, BlockNumber(18)},
 		7:  {`"0x7fffffffffffffff"`, false, BlockNumber(math.MaxInt64)},
 		8:  {`"0x8000000000000000"`, true, BlockNumber(0)},
-		9:  {`"ff"`, true, BlockNumber(0)},
-		10: {`"pending"`, false, PendingBlockNumber},
-		11: {`"latest"`, false, LatestBlockNumber},
-		12: {`"earliest"`, false, EarliestBlockNumber},
-		13: {`"committed"`, false, CommittedBlockNumber},
-		14: {`"finalized"`, false, CommittedBlockNumber},
-		15: {`someString`, true, BlockNumber(0)},
-		16: {`""`, true, BlockNumber(0)},
-		17: {``, true, BlockNumber(0)},
-		18: {`88439993`, false, BlockNumber(88439993)},
+		9:  {"0", false, BlockNumber(0)},
+		10: {`"ff"`, true, BlockNumber(0)},
+		11: {`"pending"`, false, PendingBlockNumber},
+		12: {`"latest"`, false, LatestBlockNumber},
+		13: {`"earliest"`, false, EarliestBlockNumber},
+		14: {`"committed"`, false, CommittedBlockNumber},
+		15: {`"finalized"`, false, CommittedBlockNumber},
+		16: {`someString`, true, BlockNumber(0)},
+		17: {`""`, true, BlockNumber(0)},
+		18: {``, true, BlockNumber(0)},
+		19: {`88439993`, false, BlockNumber(88439993)},
 	}
 
 	for i, test := range tests {