diff --git a/wgpu-hal/src/gles/queue.rs b/wgpu-hal/src/gles/queue.rs
index 124a0c40930..31c837cdbbc 100644
--- a/wgpu-hal/src/gles/queue.rs
+++ b/wgpu-hal/src/gles/queue.rs
@@ -463,8 +463,9 @@ impl super::Queue {
                         .map_or(copy.size.width * format_info.block_size as u32, |bpr| {
                             bpr.get()
                         });
-                    let minimum_rows_per_image =
-                        u32::max(1, copy.size.height / format_info.block_dimensions.1 as u32);
+                    let block_height = format_info.block_dimensions.1 as u32;
+                    let minimum_rows_per_image = (copy.size.height + block_height - 1)
+                        / format_info.block_dimensions.1 as u32;
                     let rows_per_image = copy
                         .buffer_layout
                         .rows_per_image