diff --git a/t/test-lib.sh b/t/test-lib.sh
index d1d24c4124..ceefb99bff 100644
--- a/t/test-lib.sh
+++ b/t/test-lib.sh
@@ -1532,6 +1532,12 @@ then
 	BAIL_OUT 'You need to build test-tool; Run "make t/helper/test-tool" in the source (toplevel) directory'
 fi
 
+if test -n "$HARNESS_ACTIVE"
+then
+	say "TAP version 13"
+	say "pragma +strict"
+fi
+
 # Are we running this test at all?
 remove_trash=
 this_test=${0##*/}