diff --git a/permanently_delete_files.py b/permanently_delete_files.py
index ba6b3f2..c7d2b77 100644
--- a/permanently_delete_files.py
+++ b/permanently_delete_files.py
@@ -49,8 +49,8 @@ try:
             for dobject in listing['body']['versions']:
                 if dobject['versionId'] != None and dobject['isLatest'] != True:
                     actualObject = Object(
-                        key=f'{dobject['key']}',
-                        versionId=f['versionId']
+                        key=f"{dobject['key']}",
+                        versionId=f"{dobject['versionId']}"
                     )
                     actualVersions.append(actualObject)
 
@@ -58,8 +58,8 @@ try:
                 file_key = file_marker['key']
                 file_version = file_marker['versionId']
                 deleteMarkerObject = Object(
-                    key=f'{dobject['key']}',
-                    versionId=f['versionId']
+                    key=f"{dobject['key']}",
+                    versionId=f"{dobject['versionId']}"
                 )
                 deleteVersions.append(deleteMarkerObject)