diff --git a/scripts/gzvcf2plink b/scripts/gzvcf2plink
index ab5bd3d..5ebd473 100755
--- a/scripts/gzvcf2plink
+++ b/scripts/gzvcf2plink
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 set  -e
 set  -x
 
diff --git a/scripts/vcf2plink b/scripts/vcf2plink
index 8f9b148..3ff368e 100755
--- a/scripts/vcf2plink
+++ b/scripts/vcf2plink
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 set  -e
 set  -x