diff --git a/graphql/errors.go b/graphql/errors.go
index 6f3661f97a..70afd2d229 100644
--- a/graphql/errors.go
+++ b/graphql/errors.go
@@ -25,6 +25,7 @@ var (
 	errOnlyNumberOrHash  = invalidParamsError("only one of number or hash must be specified")
 	errBlockInvariant    = invalidParamsError("block objects must be instantiated with at least one of num or hash")
 	errInvalidBlockRange = invalidParamsError("invalid from and to block combination: from > to")
+	errFromBlockRequired = invalidParamsError("from block number must be specified")
 )
 
 const (
diff --git a/graphql/graphql.go b/graphql/graphql.go
index f0b2bfb634..e13fbba34b 100644
--- a/graphql/graphql.go
+++ b/graphql/graphql.go
@@ -1320,7 +1320,7 @@ func (r *Resolver) Blocks(ctx context.Context, args struct {
 	To   *Long
 }) ([]*Block, error) {
 	if args.From == nil {
-		return nil, errors.New("from block number must be specified")
+		return nil, errFromBlockRequired
 	}
 	from := rpc.BlockNumber(*args.From)
 
diff --git a/graphql/graphql_test.go b/graphql/graphql_test.go
index f760106d35..9580fa5db8 100644
--- a/graphql/graphql_test.go
+++ b/graphql/graphql_test.go
@@ -150,7 +150,7 @@ func TestGraphQLBlockSerialization(t *testing.T) {
 		},
 		{
 			body: `{"query": "{blocks {number}}"}`,
-			want: `{"errors":[{"message":"from block number must be specified","path":["blocks"]}],"data":null}`,
+			want: `{"errors":[{"message":"error [-32602]: from block number must be specified","path":["blocks"],"extensions":{"errorCode":-32602,"errorMessage":"from block number must be specified"}}],"data":null}`,
 			code: 400,
 		},
 		// invalid block range