diff --git a/pkg/deb/backports/stretch b/pkg/deb/backports/stretch
index 4ecde64b1..4166dccbc 100755
--- a/pkg/deb/backports/stretch
+++ b/pkg/deb/backports/stretch
@@ -33,6 +33,7 @@ sname:=rtpengine\
 # Source version\
 sversion:=$(DEB_VERSION_UPSTREAM)\
 ## end of kernel package specific stuff\
+export SHELL=/bin/bash\
 ;' "${DIST}"/rules
 sed -i 's;^execute_before_dh_auto_install-indep:;execute_before_dh_auto_install-indep:\
 \t# Create the directories to install the source into\
diff --git a/utils/build_test_wrapper b/utils/build_test_wrapper
index 6bbaace72..56dc338db 100755
--- a/utils/build_test_wrapper
+++ b/utils/build_test_wrapper
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 TARGET=$1
 ROOT=$(echo "$TARGET" | sed 's/\.h$//')
 if test "x$MAKE" = x; then