diff --git a/wgpu/src/backend/web.rs b/wgpu/src/backend/web.rs
index 4cbe2985c4..58125aa6f5 100644
--- a/wgpu/src/backend/web.rs
+++ b/wgpu/src/backend/web.rs
@@ -700,7 +700,7 @@ fn map_extent_3d(extent: wgt::Extent3d) -> web_sys::GpuExtent3dDict {
     let mut mapped = web_sys::GpuExtent3dDict::new();
     mapped.depth(extent.depth);
     mapped.height(extent.height);
-    mapped.width(extent.height);
+    mapped.width(extent.width);
     mapped
 }