diff --git a/testdata/testoutput22-16 b/testdata/testoutput22-16
index c161ff5..88f827c 100644
--- a/testdata/testoutput22-16
+++ b/testdata/testoutput22-16
@@ -166,4 +166,9 @@ No match
     a\x{100}b
  0: a\x{100}b
 
+/^ab\C/utf,no_start_optimize
+\= Expect no match - tests \C at end of subject
+    ab
+No match
+
 # End of testinput22
diff --git a/testdata/testoutput22-32 b/testdata/testoutput22-32
index 100333f..ac485fc 100644
--- a/testdata/testoutput22-32
+++ b/testdata/testoutput22-32
@@ -164,4 +164,9 @@ No match
     a\x{100}b
  0: a\x{100}b
 
+/^ab\C/utf,no_start_optimize
+\= Expect no match - tests \C at end of subject
+    ab
+No match
+
 # End of testinput22