diff --git a/src/error/GraphQLError.d.ts b/src/error/GraphQLError.d.ts
index bb574f9f05..95f39ba483 100644
--- a/src/error/GraphQLError.d.ts
+++ b/src/error/GraphQLError.d.ts
@@ -76,7 +76,7 @@ export class GraphQLError extends Error {
   /**
    * The original error thrown from a field resolver during execution.
    */
-  readonly originalError: Error | undefined;
+  readonly originalError: Error | undefined | null;
 
   /**
    * Extension fields to add to the formatted error.
diff --git a/src/error/GraphQLError.js b/src/error/GraphQLError.js
index 7552bb473d..d3068adacb 100644
--- a/src/error/GraphQLError.js
+++ b/src/error/GraphQLError.js
@@ -56,7 +56,7 @@ export class GraphQLError extends Error {
   /**
    * The original error thrown from a field resolver during execution.
    */
-  +originalError: Error | void;
+  +originalError: Error | void | null;
 
   /**
    * Extension fields to add to the formatted error.