diff --git a/src/index.ts b/src/index.ts
index 8c0423f..f79f5d6 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -237,7 +237,7 @@ function getByPath<T extends SearchableObject, P extends PathEntry<T> & string>(
     if (
       typeof current !== 'object' ||
       current === null ||
-      !current.hasOwnProperty(pathPart)
+      !(pathPart in current)
     ) {
       return undefined
     }
@@ -282,7 +282,7 @@ function setByPath<
     if (
       typeof current !== 'object' ||
       current === null ||
-      !current.hasOwnProperty(pathPart)
+      !(pathPart in current)
     ) {
       throwAssignmentError(current, pathPart)
     }