--- a/Makefile.am
+++ b/Makefile.am
@@ -45,7 +47,7 @@
 check_PROGRAMS=
 
 TESTS=			t.smoke t.validate-xhtml10 t.validate-xhtml t.x509_name_match
-TESTS_ENVIRONMENT=	srcdir="$(srcdir)" LC_ALL=C TZ=UTC SHELL="$(SHELL)" $(SHELL)
+TESTS_ENVIRONMENT=	srcdir="$(srcdir)" LC_ALL=C TZ=UTC SHELL="$(SHELL)"
 
 if NEED_TRIO
 noinst_LIBRARIES+=	libtrio.a