diff --git a/nsock/tests/run_tests.sh b/nsock/tests/run_tests.sh
index 8ddf03819..8748c0740 100755
--- a/nsock/tests/run_tests.sh
+++ b/nsock/tests/run_tests.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 # nsock regression test suite
 # Same license as nmap -- see http://nmap.org/book/man-legal.html