diff --git a/tests/test-mdeque.c b/tests/test-mdeque.c
index 9f408f44..ddcca39c 100644
--- a/tests/test-mdeque.c
+++ b/tests/test-mdeque.c
@@ -210,4 +210,5 @@ int main(void)
   test_ti1(10000);
   test_it();
   test_set();
+  exit(0);
 }
diff --git a/tests/test-mgenint.c b/tests/test-mgenint.c
index f32ac1ad..b7535410 100644
--- a/tests/test-mgenint.c
+++ b/tests/test-mgenint.c
@@ -51,4 +51,5 @@ int main(void)
   for(size_t n = 1; n < 256; n++) {
     test(n);
   }
+  exit(0);
 }
diff --git a/tests/test-mprioqueue.c b/tests/test-mprioqueue.c
index 00346b52..38c4225d 100644
--- a/tests/test-mprioqueue.c
+++ b/tests/test-mprioqueue.c
@@ -99,4 +99,5 @@ int main(void)
 {
   test1();
   test2();
+  exit(0);
 }
diff --git a/tests/test-mworker.c b/tests/test-mworker.c
index 1c8ee675..878dfefb 100644
--- a/tests/test-mworker.c
+++ b/tests/test-mworker.c
@@ -104,4 +104,5 @@ int main(void)
 {
   test1();
   test2();
+  exit(0);
 }