diff --git a/components/script/dom/webgl2renderingcontext.rs b/components/script/dom/webgl2renderingcontext.rs
index 1f6bc4f853a..81a1688c68b 100644
--- a/components/script/dom/webgl2renderingcontext.rs
+++ b/components/script/dom/webgl2renderingcontext.rs
@@ -241,7 +241,7 @@ impl WebGL2RenderingContextMethods for WebGL2RenderingContext {
     }
 
     /// https://www.khronos.org/registry/webgl/specs/latest/1.0/#5.14.5
-    fn BufferSubData(&self, target: u32, offset: i64, data: Option<ArrayBufferViewOrArrayBuffer>) {
+    fn BufferSubData(&self, target: u32, offset: i64, data: ArrayBufferViewOrArrayBuffer) {
         self.base.BufferSubData(target, offset, data)
     }
 
diff --git a/components/script/dom/webglrenderingcontext.rs b/components/script/dom/webglrenderingcontext.rs
index 31dcc7b647f..eca047d66d8 100644
--- a/components/script/dom/webglrenderingcontext.rs
+++ b/components/script/dom/webglrenderingcontext.rs
@@ -1711,13 +1711,11 @@ impl WebGLRenderingContextMethods for WebGLRenderingContext {
     }
 
     // https://www.khronos.org/registry/webgl/specs/latest/1.0/#5.14.5
-    fn BufferSubData(&self, target: u32, offset: i64, data: Option<ArrayBufferViewOrArrayBuffer>) {
+    fn BufferSubData(&self, target: u32, offset: i64, data: ArrayBufferViewOrArrayBuffer) {
         let data_vec = match data {
             // Typed array is rooted, so we can safely temporarily retrieve its slice
-            Some(ArrayBufferViewOrArrayBuffer::ArrayBuffer(mut inner)) => inner.to_vec(),
-            Some(ArrayBufferViewOrArrayBuffer::ArrayBufferView(mut inner)) => inner.to_vec(),
-            // Spec: If data is null then an INVALID_VALUE error is generated.
-            None => return self.webgl_error(InvalidValue),
+            ArrayBufferViewOrArrayBuffer::ArrayBuffer(mut inner) => inner.to_vec(),
+            ArrayBufferViewOrArrayBuffer::ArrayBufferView(mut inner) => inner.to_vec(),
         };
 
         let bound_buffer = handle_potential_webgl_error!(self, self.bound_buffer(target), return);
diff --git a/components/script/dom/webidls/WebGLRenderingContext.webidl b/components/script/dom/webidls/WebGLRenderingContext.webidl
index cd89abccee4..9eded76a9ec 100644
--- a/components/script/dom/webidls/WebGLRenderingContext.webidl
+++ b/components/script/dom/webidls/WebGLRenderingContext.webidl
@@ -496,7 +496,7 @@ interface WebGLRenderingContextBase
     void bufferData(GLenum target, object? data, GLenum usage);
     [Throws]
     void bufferData(GLenum target, GLsizeiptr size, GLenum usage);
-    void bufferSubData(GLenum target, GLintptr offset, /*[AllowShared]*/ BufferSource? data);
+    void bufferSubData(GLenum target, GLintptr offset, /*[AllowShared]*/ BufferSource data);
 
     [WebGLHandlesContextLoss] GLenum checkFramebufferStatus(GLenum target);
     void clear(GLbitfield mask);