diff --git a/packages/types-ios/src/lib/ios/interop.d.ts b/packages/types-ios/src/lib/ios/interop.d.ts
index f356f541b..8f18869fa 100644
--- a/packages/types-ios/src/lib/ios/interop.d.ts
+++ b/packages/types-ios/src/lib/ios/interop.d.ts
@@ -76,6 +76,14 @@ declare module interop {
      */
     function bufferFromData(data: NSData): ArrayBuffer;
 
+    /**
+     * Converts a CString to a JavaScript string.
+     * @param cString A pointer to a CString.
+     * @param lengthInBytes The length of the string in bytes. UTF-8 characters may be more than one byte. If not provided the string is assumed to be null-terminated.
+     * @returns A JavaScript string with length <= lengthInBytes.
+     */
+    function stringFromCString(cString: Pointer | Reference<number>, lengthInBytes?: number): string;
+
     /**
      * A type that wraps a pointer and allows read/write operations on its value.
      */