diff --git a/src/scene/shader-lib/glsl/chunks/gsplat/vert/gsplatCorner.js b/src/scene/shader-lib/glsl/chunks/gsplat/vert/gsplatCorner.js
index 5279967b76c..5b0c8604859 100644
--- a/src/scene/shader-lib/glsl/chunks/gsplat/vert/gsplatCorner.js
+++ b/src/scene/shader-lib/glsl/chunks/gsplat/vert/gsplatCorner.js
@@ -46,7 +46,7 @@ bool initCorner(SplatSource source, SplatCenter center, out SplatCorner corner)
     float lambda2 = max(mid - radius, 0.1);
 
     // Use the smaller viewport dimension to limit the kernel size relative to the screen resolution.
-    float vmin = min(viewport.x, viewport.y);
+    float vmin = min(1024.0, min(viewport.x, viewport.y));
 
     float l1 = 2.0 * min(sqrt(2.0 * lambda1), vmin);
     float l2 = 2.0 * min(sqrt(2.0 * lambda2), vmin);
diff --git a/src/scene/shader-lib/wgsl/chunks/gsplat/vert/gsplatCorner.js b/src/scene/shader-lib/wgsl/chunks/gsplat/vert/gsplatCorner.js
index f62a010d33a..9f67213a4d4 100644
--- a/src/scene/shader-lib/wgsl/chunks/gsplat/vert/gsplatCorner.js
+++ b/src/scene/shader-lib/wgsl/chunks/gsplat/vert/gsplatCorner.js
@@ -47,7 +47,7 @@ fn initCorner(source: ptr<function, SplatSource>, center: ptr<function, SplatCen
     let lambda2 = max(mid - radius, 0.1);
 
     // Use the smaller viewport dimension to limit the kernel size relative to the screen resolution.
-    let vmin = min(uniform.viewport.x, uniform.viewport.y);
+    let vmin = min(1024.0, min(uniform.viewport.x, uniform.viewport.y));
 
     let l1 = 2.0 * min(sqrt(2.0 * lambda1), vmin);
     let l2 = 2.0 * min(sqrt(2.0 * lambda2), vmin);