diff --git a/testing/run_regressions.sh b/testing/run_regressions.sh
index c14e1da4..043b83b8 100755
--- a/testing/run_regressions.sh
+++ b/testing/run_regressions.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 #
 # Run the regression tests and display differences
 #