--- a/gfx/gl/SharedSurfaceEGL.cpp
+++ b/gfx/gl/SharedSurfaceEGL.cpp
@@ -34,17 +34,17 @@ SharedSurface_EGLImage::Create(GLContext
     }
 
     MOZ_ALWAYS_TRUE(prodGL->MakeCurrent());
     GLuint prodTex = CreateTextureForOffscreen(prodGL, formats, size);
     if (!prodTex) {
         return Move(ret);
     }
 
-    EGLClientBuffer buffer = reinterpret_cast<EGLClientBuffer>(prodTex);
+    EGLClientBuffer buffer = reinterpret_cast<EGLClientBuffer>(uintptr_t(prodTex));
     EGLImage image = egl->fCreateImage(egl->Display(), context,
                                        LOCAL_EGL_GL_TEXTURE_2D, buffer,
                                        nullptr);
     if (!image) {
         prodGL->fDeleteTextures(1, &prodTex);
         return Move(ret);
     }