diff --git a/wgpu-hal/src/gles/adapter.rs b/wgpu-hal/src/gles/adapter.rs
index 00db6aba61..e46c91ab9c 100644
--- a/wgpu-hal/src/gles/adapter.rs
+++ b/wgpu-hal/src/gles/adapter.rs
@@ -1136,7 +1136,7 @@ impl crate::Adapter<super::Api> for super::Adapter {
             Some(crate::SurfaceCapabilities {
                 formats,
                 present_modes: if cfg!(windows) {
-                    vec![wgt::PresentMode::Fifo, wgt::PresentMode::Mailbox]
+                    vec![wgt::PresentMode::Fifo, wgt::PresentMode::Immediate]
                 } else {
                     vec![wgt::PresentMode::Fifo] //TODO
                 },
diff --git a/wgpu-hal/src/gles/wgl.rs b/wgpu-hal/src/gles/wgl.rs
index 6e68607286..a09a50330d 100644
--- a/wgpu-hal/src/gles/wgl.rs
+++ b/wgpu-hal/src/gles/wgl.rs
@@ -744,7 +744,7 @@ impl crate::Surface<super::Api> for Surface {
         }
 
         let vsync = match config.present_mode {
-            wgt::PresentMode::Mailbox => false,
+            wgt::PresentMode::Immediate => false,
             wgt::PresentMode::Fifo => true,
             _ => {
                 log::error!("unsupported present mode: {:?}", config.present_mode);