diff --git a/src/mesa/drivers/dri/i965/brw_context.h b/src/mesa/drivers/dri/i965/brw_context.h
index d00fe351087..4b78508ccb3 100644
--- a/src/mesa/drivers/dri/i965/brw_context.h
+++ b/src/mesa/drivers/dri/i965/brw_context.h
@@ -980,7 +980,7 @@ struct brw_context
     * Number of samples in ctx->DrawBuffer, updated by BRW_NEW_NUM_SAMPLES so
     * that we don't have to reemit that state every time we change FBOs.
     */
-   int num_samples;
+   unsigned int num_samples;
 
    /* BRW_NEW_URB_ALLOCATIONS:
     */