diff --git a/example/QCheck_runner_test.expected.ocaml4.32 b/example/QCheck_runner_test.expected.ocaml4.32
index 5eb9e10c..e5267ef6 100644
--- a/example/QCheck_runner_test.expected.ocaml4.32
+++ b/example/QCheck_runner_test.expected.ocaml4.32
@@ -82,7 +82,7 @@ Test FAIL_pred_map_commute failed (47 shrink steps):
 
 Test FAIL_fun2_pred_strings failed (1 shrink steps):
 
-{some other string -> false; _ -> true}
+{"some other string" -> false; _ -> true}
 
 --- Failure --------------------------------------------------------------------
 
diff --git a/example/QCheck_runner_test.expected.ocaml4.64 b/example/QCheck_runner_test.expected.ocaml4.64
index f54f8f4f..59ec0bd2 100644
--- a/example/QCheck_runner_test.expected.ocaml4.64
+++ b/example/QCheck_runner_test.expected.ocaml4.64
@@ -82,7 +82,7 @@ Test FAIL_pred_map_commute failed (77 shrink steps):
 
 Test FAIL_fun2_pred_strings failed (1 shrink steps):
 
-{some other string -> false; _ -> true}
+{"some other string" -> false; _ -> true}
 
 --- Failure --------------------------------------------------------------------
 
diff --git a/example/QCheck_runner_test.expected.ocaml5.32 b/example/QCheck_runner_test.expected.ocaml5.32
index 4a96b674..8c595f9b 100644
--- a/example/QCheck_runner_test.expected.ocaml5.32
+++ b/example/QCheck_runner_test.expected.ocaml5.32
@@ -82,7 +82,7 @@ Test FAIL_pred_map_commute failed (47 shrink steps):
 
 Test FAIL_fun2_pred_strings failed (1 shrink steps):
 
-{some other string -> false; _ -> true}
+{"some other string" -> false; _ -> true}
 
 --- Failure --------------------------------------------------------------------
 
diff --git a/example/QCheck_runner_test.expected.ocaml5.64 b/example/QCheck_runner_test.expected.ocaml5.64
index 6e700e68..da15642d 100644
--- a/example/QCheck_runner_test.expected.ocaml5.64
+++ b/example/QCheck_runner_test.expected.ocaml5.64
@@ -82,7 +82,7 @@ Test FAIL_pred_map_commute failed (79 shrink steps):
 
 Test FAIL_fun2_pred_strings failed (1 shrink steps):
 
-{some other string -> false; _ -> true}
+{"some other string" -> false; _ -> true}
 
 --- Failure --------------------------------------------------------------------