diff --git a/App/tools/driver.makefile b/App/tools/driver.makefile
index c347235..76e601f 100644
--- a/App/tools/driver.makefile
+++ b/App/tools/driver.makefile
@@ -341,6 +341,7 @@ ${CONFIG}/CONFIG:
 EB:=${EPICS_BASE}
 TOP:=${EPICS_BASE}
 -include ${CONFIG}/CONFIG
+SHELL = /bin/bash -O extglob
 BASE_CPPFLAGS=
 EPICS_BASE:=${EB}
 COMMON_DIR = O.${EPICSVERSION}_Common