diff --git a/t/annotate-tests.sh b/t/annotate-tests.sh
index 015acabf30..bbf3ee6892 100644
--- a/t/annotate-tests.sh
+++ b/t/annotate-tests.sh
@@ -185,6 +185,10 @@ test_expect_success 'blame -L Y,X (undocumented)' '
 	check_count -L6,3 B 1 B1 1 B2 1 D 1
 '
 
+test_expect_failure 'blame -L X,+0' '
+	test_must_fail $PROG -L1,+0 file
+'
+
 test_expect_success 'blame -L X,+1' '
 	check_count -L3,+1 B2 1
 '
@@ -193,6 +197,10 @@ test_expect_success 'blame -L X,+N' '
 	check_count -L3,+4 B 1 B1 1 B2 1 D 1
 '
 
+test_expect_failure 'blame -L X,-0' '
+	test_must_fail $PROG -L1,-0 file
+'
+
 test_expect_success 'blame -L X,-1' '
 	check_count -L3,-1 B2 1
 '