diff --git a/src/mesa/drivers/dri/unichrome/via_context.c b/src/mesa/drivers/dri/unichrome/via_context.c
index 4d25d32..2e29b53 100644
--- a/src/mesa/drivers/dri/unichrome/via_context.c
+++ b/src/mesa/drivers/dri/unichrome/via_context.c
@@ -222,7 +222,9 @@ calculate_buffer_parameters(struct via_context *vmesa,
       /* do one-time init for the renderbuffers */
       viaInitRenderbuffer(&vmesa->front, GL_RGBA, dPriv);
       viaSetSpanFunctions(&vmesa->front, &fb->Visual);
-      _mesa_add_renderbuffer(fb, BUFFER_FRONT_LEFT, &vmesa->front.Base);
+      if (!fb->Attachment[BUFFER_FRONT_LEFT].Renderbuffer) {
+         _mesa_add_renderbuffer(fb, BUFFER_FRONT_LEFT, &vmesa->front.Base);
+      }
 
       if (fb->Visual.doubleBufferMode) {
          viaInitRenderbuffer(&vmesa->back, GL_RGBA, dPriv);