diff --git a/cxxmph/test.cc b/cxxmph/test.cc
index 366e39b..a20355d 100644
--- a/cxxmph/test.cc
+++ b/cxxmph/test.cc
@@ -2,13 +2,19 @@
 
 #include "test.h"
 
-Suite* global_suite = suite_create("cxxmph_test_suite");
-TCase* global_tc_core = tcase_create("Core");
+Suite* global_suite() {
+  static Suite* gs = suite_create("cxxmph_test_suite");
+  return gs;
+}
+TCase* global_tc_core() {
+  static TCase* gtc = tcase_create("Core");
+  return gtc;
+}
 
 int main (void) {
-  suite_add_tcase(global_suite, global_tc_core);
+  suite_add_tcase(global_suite(), global_tc_core());
   int number_failed;
-  SRunner *sr = srunner_create (global_suite);
+  SRunner *sr = srunner_create (global_suite());
   srunner_run_all (sr, CK_NORMAL);
   number_failed = srunner_ntests_failed (sr);
   srunner_free (sr);
diff --git a/cxxmph/test.h b/cxxmph/test.h
index 3054b6f..31a854c 100644
--- a/cxxmph/test.h
+++ b/cxxmph/test.h
@@ -9,9 +9,10 @@
 // included last.
 
 #include <check.h>
+#include <stdio.h>
 
-extern Suite* global_suite;
-extern TCase* global_tc_core;
+Suite* global_suite();
+TCase* global_tc_core();
 
 // Creates a new test case calling boolean_function. Name must be a valid,
 // unique c identifier when prefixed with tc_.
@@ -24,7 +25,7 @@ extern TCase* global_tc_core;
 
 struct TestCase {
   TestCase(void (*f)(int)) {
-    tcase_add_test(global_tc_core, f);
+    tcase_add_test(global_tc_core(), f);
   }
 };