diff --git a/t/Makefile b/t/Makefile
index 225aaf78ed..f7876909aa 100644
--- a/t/Makefile
+++ b/t/Makefile
@@ -35,7 +35,7 @@ PERL_PATH_SQ = $(subst ','\'',$(PERL_PATH))
 TEST_RESULTS_DIRECTORY_SQ = $(subst ','\'',$(TEST_RESULTS_DIRECTORY))
 CHAINLINTTMP_SQ = $(subst ','\'',$(CHAINLINTTMP))
 
-T = $(sort $(wildcard t[0-9][0-9][0-9][0-9]-*.sh))
+T = t0013-sha1dc.sh
 THELPERS = $(sort $(filter-out $(T),$(wildcard *.sh)))
 TLIBS = $(sort $(wildcard lib-*.sh)) annotate-tests.sh
 TPERF = $(sort $(wildcard perf/p[0-9][0-9][0-9][0-9]-*.sh))