diff --git a/source/tools/quota.ts b/source/tools/quota.ts
index eecc768..1bd22e9 100644
--- a/source/tools/quota.ts
+++ b/source/tools/quota.ts
@@ -11,7 +11,8 @@ export function parseQuota(result: DAVResult): DiskQuota | null {
         } = responseItem;
         return typeof quotaUsed !== "undefined" && typeof quotaAvail !== "undefined"
             ? {
-                  used: parseInt(quotaUsed, 10),
+                  // As it could be both a string or a number ensure we are working with a number
+                  used: parseInt(String(quotaUsed), 10),
                   available: translateDiskSpace(quotaAvail)
               }
             : null;
diff --git a/source/types.ts b/source/types.ts
index f6f328f..18d6092 100644
--- a/source/types.ts
+++ b/source/types.ts
@@ -70,8 +70,8 @@ export interface DAVResultResponseProps {
     getetag?: string;
     getcontentlength?: string;
     getcontenttype?: string;
-    "quota-available-bytes"?: any;
-    "quota-used-bytes"?: string;
+    "quota-available-bytes"?: string | number;
+    "quota-used-bytes"?: string | number;
 
     [additionalProp: string]: unknown;
 }