diff --git a/vulkan-rs/src/image.rs b/vulkan-rs/src/image.rs
index 3502a18..9d40c43 100644
--- a/vulkan-rs/src/image.rs
+++ b/vulkan-rs/src/image.rs
@@ -1048,7 +1048,7 @@ fn copy_buffers_to_image<'a, T: ReprC + Send + Sync + 'static>(
 where
     T: Copy,
 {
-    debug_assert!(buffers.len() < image.layers as usize);
+    debug_assert!(buffers.len() == image.layers as usize);
 
     // create a new command buffer
     let command_buffer = CommandBuffer::new_primary().build(device.clone(), queue.clone())?;