diff --git a/proto/col_nothing.go b/proto/col_nothing.go
index 79e5b188..75a0db70 100644
--- a/proto/col_nothing.go
+++ b/proto/col_nothing.go
@@ -12,7 +12,7 @@ type Nothing struct{}
 type ColNothing int
 
 func (c *ColNothing) Append(v Nothing) {
-	*c += 1
+	*c++
 }
 
 func (c ColNothing) Row(i int) Nothing {