diff --git a/tests/test-marray.c b/tests/test-marray.c
index 01ab7100..a0123f2f 100644
--- a/tests/test-marray.c
+++ b/tests/test-marray.c
@@ -210,4 +210,5 @@ int main(void)
 {
   test_uint();
   test_mpz();
+  exit(0);
 }
diff --git a/tests/test-mbuffer.c b/tests/test-mbuffer.c
index 41016308..d146df30 100644
--- a/tests/test-mbuffer.c
+++ b/tests/test-mbuffer.c
@@ -264,4 +264,5 @@ int main(void)
   test_stack2();
   test_no_thread();
   test_global_ishared();
+  exit(0);
 }
diff --git a/tests/test-mcore.c b/tests/test-mcore.c
index 6b11479c..5d9b0ea4 100644
--- a/tests/test-mcore.c
+++ b/tests/test-mcore.c
@@ -155,8 +155,5 @@ int main(void)
   test_invert();
   test_min();
   test_let();
-  return 0;
+  exit(0);
 }
-
-
-  
diff --git a/tests/test-mdict.c b/tests/test-mdict.c
index f98025f9..4e947afd 100644
--- a/tests/test-mdict.c
+++ b/tests/test-mdict.c
@@ -159,7 +159,7 @@ int main(void)
   init_data(5000000);
   test_data();
   clear_data();
-  return 0;
+  exit(0);
 }
 
 /*
diff --git a/tests/test-mlist.c b/tests/test-mlist.c
index 8b858b7b..af3926bd 100644
--- a/tests/test-mlist.c
+++ b/tests/test-mlist.c
@@ -227,4 +227,5 @@ int main(void)
 {
   test_uint();
   test_mpz();
+  exit(0);
 }
diff --git a/tests/test-mrbtree.c b/tests/test-mrbtree.c
index e50e5ac3..837ad340 100644
--- a/tests/test-mrbtree.c
+++ b/tests/test-mrbtree.c
@@ -162,5 +162,5 @@ int main(void)
   test_uint();
   test_float();
   test_io();
-  return 0;
+  exit(0);
 }
diff --git a/tests/test-mshared.c b/tests/test-mshared.c
index 16397655..4e3caa08 100644
--- a/tests/test-mshared.c
+++ b/tests/test-mshared.c
@@ -55,5 +55,5 @@ int main(void)
   assert(shared_int_NULL_p(p1));
   shared_int_clear(p1);
 
-  return 0;
+  exit(0);
 }
diff --git a/tests/test-msnapshot.c b/tests/test-msnapshot.c
index e2eb587e..384955b4 100644
--- a/tests/test-msnapshot.c
+++ b/tests/test-msnapshot.c
@@ -70,5 +70,6 @@ static void test_uint(void)
 int main(void)
 {
   test_uint();
+  exit(0);
 }
 
diff --git a/tests/test-mstring.c b/tests/test-mstring.c
index ecb83f15..1989ad1f 100644
--- a/tests/test-mstring.c
+++ b/tests/test-mstring.c
@@ -192,4 +192,5 @@ int main(void)
   assert (string_equal_p(s1, s2));
 
   string_clear (s1);
+  exit(0);
 }
diff --git a/tests/test-mtuple.c b/tests/test-mtuple.c
index 5ef4c912..338a667f 100644
--- a/tests/test-mtuple.c
+++ b/tests/test-mtuple.c
@@ -113,5 +113,5 @@ int main(void)
   mpz_clear(z);
 
   check_io();
-  return 0;
+  exit(0);
 }
diff --git a/tests/test-mvariant.c b/tests/test-mvariant.c
index 80c98c54..9f40f05b 100644
--- a/tests/test-mvariant.c
+++ b/tests/test-mvariant.c
@@ -172,6 +172,6 @@ int main(void)
   test_pair();
   test_triple();
   test_io();
-  return 0;
+  exit(0);
 }