diff --git a/misc/merge_demultiplexed_fastq.R b/misc/merge_demultiplexed_fastq.R
index 0d1400c..70e3f9b 100644
--- a/misc/merge_demultiplexed_fastq.R
+++ b/misc/merge_demultiplexed_fastq.R
@@ -1,3 +1,5 @@
+#!/usr/bin/env Rscript
+
 library(stringi)
 library(optparse)
 library(data.table)