diff --git a/components/script/dom/webglrenderingcontext.rs b/components/script/dom/webglrenderingcontext.rs
index 7972201b9ce..d832776230d 100644
--- a/components/script/dom/webglrenderingcontext.rs
+++ b/components/script/dom/webglrenderingcontext.rs
@@ -437,9 +437,13 @@ impl WebGLRenderingContext {
     }
 
     fn mark_as_dirty(&self) {
-        self.canvas
-            .upcast::<Node>()
-            .dirty(NodeDamage::OtherNodeDamage);
+        // If we don't have a bound framebuffer, then don't mark the canvas
+        // as dirty.
+        if self.bound_framebuffer.get().is_none() {
+            self.canvas
+                .upcast::<Node>()
+                .dirty(NodeDamage::OtherNodeDamage);
+        }
     }
 
     fn vertex_attrib(&self, indx: u32, x: f32, y: f32, z: f32, w: f32) {