diff --git a/regenerate-cores.sh b/regenerate-cores.sh
index 64b7405..2cb8d85 100755
--- a/regenerate-cores.sh
+++ b/regenerate-cores.sh
@@ -1,4 +1,4 @@
-#! /bin/sh -ea
+#! /bin/bash -ea
 
 set -o pipefail