diff --git a/.travis.yml b/.travis.yml
index cdcc871..182d83e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,4 +5,4 @@ install:
     - curl -L "http://archive.ubuntu.com/ubuntu/pool/universe/s/shellcheck/shellcheck_0.3.7-1_amd64.deb" -o "/tmp/shellcheck_0.3.7-1_amd64.deb"
     - '[ "$(openssl dgst -sha256 "/tmp/shellcheck_0.3.7-1_amd64.deb" | cut -d " " -f 2)" == "1622b0ebead82475946188c7ace2afe012607c1b064d2888556f296a28cd1927" ]'
     - sudo dpkg -i "/tmp/shellcheck_0.3.7-1_amd64.deb"
-script: make && make test
+script: make && make test SHELL="bash -x"
diff --git a/test/Makefile b/test/Makefile
index 4ab2373..03a318a 100644
--- a/test/Makefile
+++ b/test/Makefile
@@ -3,7 +3,7 @@ TUT=../../google-font-download
 
 # tests use bashisms, avoid failures on systems where dash is used
 # to simplify debugging failing test cases, use -x
-SHELL=bash -x
+SHELL := bash
 
 .PHONY: test $(TESTS)