diff --git a/src/platform/linux/kmsgrab.cpp b/src/platform/linux/kmsgrab.cpp
index 3db748999..3861958a9 100644
--- a/src/platform/linux/kmsgrab.cpp
+++ b/src/platform/linux/kmsgrab.cpp
@@ -1542,6 +1542,8 @@ namespace platf {
           if (monitor_descriptor.index == index && monitor_descriptor.type == type) {
             monitor_descriptor.viewport.offset_x = monitor->viewport.offset_x;
             monitor_descriptor.viewport.offset_y = monitor->viewport.offset_y;
+            monitor_descriptor.viewport.width = monitor->viewport.width;
+            monitor_descriptor.viewport.height = monitor->viewport.height;
 
             // A sanity check, it's guesswork after all.
             if (
diff --git a/src/platform/linux/wayland.cpp b/src/platform/linux/wayland.cpp
index c0afae1d8..9261d0820 100644
--- a/src/platform/linux/wayland.cpp
+++ b/src/platform/linux/wayland.cpp
@@ -144,6 +144,8 @@ namespace wl {
   }
 
   void monitor_t::xdg_size(zxdg_output_v1 *, std::int32_t width, std::int32_t height) {
+    viewport.width = width;
+    viewport.height = height;
     BOOST_LOG(info) << "Logical size: "sv << width << 'x' << height;
   }