diff --git a/webgpu.h b/webgpu.h
index 05178af6..8a82ed59 100644
--- a/webgpu.h
+++ b/webgpu.h
@@ -1096,7 +1096,7 @@ typedef struct WGPUSurfaceDescriptorFromXcbWindow {
 typedef struct WGPUSurfaceDescriptorFromXlibWindow {
     WGPUChainedStruct chain;
     void * display;
-    uint32_t window;
+    uint64_t window;
 } WGPUSurfaceDescriptorFromXlibWindow WGPU_STRUCTURE_ATTRIBUTE;
 
 typedef struct WGPUSurfaceTexture {