diff --git a/t/t_dp_red.sh b/t/t_dp_red.sh
index 3fe29be..9cd5349 100755
--- a/t/t_dp_red.sh
+++ b/t/t_dp_red.sh
@@ -28,7 +28,7 @@
 # SUCH DAMAGE.
 #
 
-. t_subr.sh
+. ./t_subr.sh
 
 ifile="${abs_srcdir}/t_dp_red.ti"
 ofile="${abs_srcdir}/t_dp_red.to"
diff --git a/t/t_subr.sh.in b/t/t_subr.sh.in
index f08ba61..c85a741 100644
--- a/t/t_subr.sh.in
+++ b/t/t_subr.sh.in
@@ -33,7 +33,7 @@
 #
 # To use this, add the following at the top of your test script:
 #
-# . t_subr.sh
+# . ./t_subr.sh
 #
 # Run your tests, invoking either not_ok() or ok() after each.
 #