diff --git a/util/test/demos/gl/gl_discard_zoo.cpp b/util/test/demos/gl/gl_discard_zoo.cpp
index 89c5d4a84..c44a8ecc8 100644
--- a/util/test/demos/gl/gl_discard_zoo.cpp
+++ b/util/test/demos/gl/gl_discard_zoo.cpp
@@ -268,8 +268,10 @@ RD_TEST(GL_Discard_Zoo, OpenGLGraphicsTest)
         glClearTexImage(texcubesub, 0, GL_RGBA, GL_FLOAT, &green.x);
         glClearTexImage(tex3dsub2, 0, GL_RGBA, GL_FLOAT, &green.x);
 
-        glNamedBufferSubDataEXT(buf, 0, 1024, empty);
-        glNamedBufferSubDataEXT(subbuf, 0, 1024, empty);
+        glBindBuffer(GL_ARRAY_BUFFER, buf);
+        glBufferSubData(GL_ARRAY_BUFFER, 0, 1024, empty);
+        glBindBuffer(GL_ARRAY_BUFFER, subbuf);
+        glBufferSubData(GL_ARRAY_BUFFER, 0, 1024, empty);
         popMarker();
       }