diff --git a/AK/ByteBuffer.h b/AK/ByteBuffer.h
index a6a4b9fe437..f3a85f9f55c 100644
--- a/AK/ByteBuffer.h
+++ b/AK/ByteBuffer.h
@@ -243,8 +243,10 @@ private:
         new_capacity = kmalloc_good_size(new_capacity);
         if (!m_inline) {
             new_buffer = (u8*)kmalloc(new_capacity);
-            if (m_outline_buffer)
+            if (m_outline_buffer) {
                 __builtin_memcpy(new_buffer, m_outline_buffer, min(new_capacity, m_outline_capacity));
+                kfree_sized(m_outline_buffer, m_outline_capacity);
+            }
             VERIFY(new_buffer);
         } else {
             new_buffer = (u8*)kmalloc(new_capacity);