diff --git a/resources/assets/typescript/Sakura/AJAX.ts b/resources/assets/typescript/Sakura/AJAX.ts
index e8d4d9d..90c94e1 100644
--- a/resources/assets/typescript/Sakura/AJAX.ts
+++ b/resources/assets/typescript/Sakura/AJAX.ts
@@ -122,7 +122,7 @@ namespace Sakura
 
         // Remove a header
         public RemoveHeader(name: string): void {
-            if ((typeof this.Headers[name]).toLowerCase() !== 'undefined') {
+            if (this.Headers[name]) {
                 delete this.Headers[name];
             }
         }
@@ -146,7 +146,7 @@ namespace Sakura
         // Delete a callback
         public RemoveCallback(status: number): void {
             // Delete the callback if present
-            if ((typeof this.Callbacks[status]).toLowerCase() === 'function') {
+            if (this.Callbacks[status]) {
                 delete this.Callbacks[status];
             }
         }