diff --git a/src/literal.ts b/src/literal.ts
index a05c7ee9d..b67862b5d 100644
--- a/src/literal.ts
+++ b/src/literal.ts
@@ -61,7 +61,7 @@ export default class Literal extends Node implements TFLiteral {
    * Gets whether two literals are the same
    * @param other The other statement
    */
-  equals (other: Term | undefined | null): boolean {
+  equals (other: Term | null | undefined): boolean {
     if (!other) {
       return false
     }
diff --git a/src/tf-types.ts b/src/tf-types.ts
index ec29e4529..ded9ada87 100644
--- a/src/tf-types.ts
+++ b/src/tf-types.ts
@@ -20,7 +20,7 @@ export interface Term {
    *
    * Note that the task force spec only allows comparison with other terms
    */
-  equals (other: Term | undefined | null): boolean
+  equals (other: Term | null | undefined): boolean
 }
 
 /**