diff --git a/src/lib/es2018.regexp.d.ts b/src/lib/es2018.regexp.d.ts
index 85e1bc909b5..2067b4846d7 100644
--- a/src/lib/es2018.regexp.d.ts
+++ b/src/lib/es2018.regexp.d.ts
@@ -8,4 +8,12 @@ interface RegExpExecArray {
     groups?: {
         [key: string]: string
     }
+}
+
+interface RegExp {
+    /**
+     * Returns a Boolean value indicating the state of the dotAll flag (s) used with a regular expression.
+     * Default is false. Read-only.
+     */
+    readonly dotAll: boolean;
 }
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