diff --git a/rpc/responses_test.go b/rpc/responses_test.go
index 43924151a..20bc8e97d 100644
--- a/rpc/responses_test.go
+++ b/rpc/responses_test.go
@@ -13,12 +13,13 @@ import (
 )
 
 const (
-	reHash       = `"0x[0-9a-f]{64}"`               // 32 bytes
-	reHashOpt    = `"(0x[0-9a-f]{64})"|null`        // 32 bytes or null
-	reAddress    = `"0x[0-9a-f]{40}"`               // 20 bytes
-	reAddressOpt = `"0x[0-9a-f]{40}"|null`          // 20 bytes or null
-	reNum        = `"0x([1-9a-f][0-9a-f]{1,15})|0"` // must not have left-padded zeros
-	reData       = `"0x[0-9a-f]*"`                  // can be "empty"
+	reHash       = `"0x[0-9a-f]{64}"`                    // 32 bytes
+	reHashOpt    = `"(0x[0-9a-f]{64})"|null`             // 32 bytes or null
+	reAddress    = `"0x[0-9a-f]{40}"`                    // 20 bytes
+	reAddressOpt = `"0x[0-9a-f]{40}"|null`               // 20 bytes or null
+	reNum        = `"0x([1-9a-f][0-9a-f]{0,15})|0"`      // must not have left-padded zeros
+	reNumOpt     = `"0x([1-9a-f][0-9a-f]{0,15})|0"|null` // must not have left-padded zeros or null
+	reData       = `"0x[0-9a-f]*"`                       // can be "empty"
 )
 
 func TestNewBlockRes(t *testing.T) {