diff --git a/main.go b/main.go
index e0c44a6..29cea99 100644
--- a/main.go
+++ b/main.go
@@ -64,7 +64,7 @@ func main() {
 		return outRows[i].NumberQueries < outRows[j].NumberQueries
 	})
 
-	f, err := os.OpenFile(*outFile, os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0600)
+	f, err := os.OpenFile(*outFile, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
 	if err != nil {
 		log.Fatalf("failed to open output file '%s': %v", *outFile, err)
 	}