diff --git a/vlib/v/tests/valgrind/1.vv b/vlib/v/tests/valgrind/1.vv
index 161c5b1c10..92dace75b7 100644
--- a/vlib/v/tests/valgrind/1.vv
+++ b/vlib/v/tests/valgrind/1.vv
@@ -16,12 +16,24 @@ fn foo() {
 	//str_inter := 'hello, $name' // concatenated strings must be freed
 
 
+
+
 	//nums.free() // this should result in a double free and a CI error
 }
 
+fn str_replace() {
+	s := 'hello world'
+	r := s.replace('hello', 'hi')
+	cloned := s.replace('hello', 'hi').clone()
+	cloned2 := r.clone()
+	println(s)
+	println(r)
+}
+
 fn main() {
 	println('start')
 	foo()
+	str_replace()
 	println('end')
 }