diff --git a/Kernel/KBuffer.h b/Kernel/KBuffer.h
index 70e56ce3c4..bae0de3483 100644
--- a/Kernel/KBuffer.h
+++ b/Kernel/KBuffer.h
@@ -68,7 +68,7 @@ public:
     u8* data() { return m_impl->data(); }
     const u8* data() const { return m_impl->data(); }
     size_t size() const { return m_impl->size(); }
-    size_t capacity() const { return m_impl->size(); }
+    size_t capacity() const { return m_impl->capacity(); }
 
     void set_size(size_t size) { m_impl->set_size(size); }