diff --git a/glamor/glamor.c b/glamor/glamor.c
index 037838840..935fb744a 100644
--- a/glamor/glamor.c
+++ b/glamor/glamor.c
@@ -454,7 +454,8 @@ glamor_init(ScreenPtr screen, unsigned int flags)
     glamor_priv->has_fbo_blit =
         epoxy_has_gl_extension("GL_EXT_framebuffer_blit");
     glamor_priv->has_map_buffer_range =
-        epoxy_has_gl_extension("GL_ARB_map_buffer_range");
+        epoxy_has_gl_extension("GL_ARB_map_buffer_range") ||
+        epoxy_has_gl_extension("GL_EXT_map_buffer_range");
     glamor_priv->has_buffer_storage =
         epoxy_has_gl_extension("GL_ARB_buffer_storage");
     glamor_priv->has_nv_texture_barrier =