diff --git a/dom/canvas/WebGL2Context.h b/dom/canvas/WebGL2Context.h
index be014440afa2..6d52b6687b9e 100644
--- a/dom/canvas/WebGL2Context.h
+++ b/dom/canvas/WebGL2Context.h
@@ -55,7 +55,16 @@ public:
                           const dom::Nullable<dom::ArrayBuffer>& maybeData);
     void GetBufferSubData(GLenum target, GLintptr offset,
                           const dom::SharedArrayBuffer& data);
+    void ReadPixels(GLint x, GLint y, GLsizei width, GLsizei height, GLenum format,
+                    GLenum type, WebGLsizeiptr offset, ErrorResult& out_error);
 
+    void ReadPixels(GLint x, GLint y, GLsizei width, GLsizei height,
+                    GLenum format, GLenum type,
+                    const dom::Nullable<dom::ArrayBufferView>& pixels,
+                    ErrorResult& out_error)
+    {
+        WebGLContext::ReadPixels(x, y, width, height, format, type, pixels, out_error);
+    }
 
     // -------------------------------------------------------------------------
     // Framebuffer objects - WebGL2ContextFramebuffers.cpp
diff --git a/dom/canvas/WebGL2ContextBuffers.cpp b/dom/canvas/WebGL2ContextBuffers.cpp
index c39b3419bae5..6b0df8cf92f6 100644
--- a/dom/canvas/WebGL2ContextBuffers.cpp
+++ b/dom/canvas/WebGL2ContextBuffers.cpp
@@ -246,4 +246,15 @@ void WebGL2Context::GetBufferSubData(GLenum target, GLintptr offset,
     GetBufferSubDataT(target, offset, data);
 }
 
+void
+WebGL2Context::ReadPixels(GLint x, GLint y, GLsizei width, GLsizei height, GLenum format,
+                          GLenum type, GLintptr offset)
+{
+    const char funcName[] = "readPixels";
+    if (IsContextLost())
+        return;
+
+    ErrorInvalidOperation("%s: Not yet implemented.", funcName);
+}
+
 } // namespace mozilla