diff --git a/tests/include/tests/isc.h b/tests/include/tests/isc.h
index db0654066b..4d8df514d4 100644
--- a/tests/include/tests/isc.h
+++ b/tests/include/tests/isc.h
@@ -90,7 +90,7 @@ teardown_managers(void **state);
 	int setup_test_##name(void **state __attribute__((unused)));
 
 #define ISC_RUN_TEST_DECLARE(name) \
-	void run_test_##name(void **state __attribute__((unused)));
+	static void run_test_##name(void **state __attribute__((unused)));
 
 #define ISC_TEARDOWN_TEST_DECLARE(name) \
 	int teardown_test_##name(void **state __attribute__((unused)))
@@ -99,9 +99,9 @@ teardown_managers(void **state);
 	int setup_test_##name(void **state __attribute__((unused))); \
 	int setup_test_##name(void **state __attribute__((unused)))
 
-#define ISC_RUN_TEST_IMPL(name)                                     \
-	void run_test_##name(void **state __attribute__((unused))); \
-	void run_test_##name(void **state __attribute__((unused)))
+#define ISC_RUN_TEST_IMPL(name)                                            \
+	static void run_test_##name(void **state __attribute__((unused))); \
+	static void run_test_##name(void **state __attribute__((unused)))
 
 #define ISC_TEARDOWN_TEST_IMPL(name)                                    \
 	int teardown_test_##name(void **state __attribute__((unused))); \
diff --git a/tests/isc/task_test.c b/tests/isc/task_test.c
index 837564eb0e..da23943b9d 100644
--- a/tests/isc/task_test.c
+++ b/tests/isc/task_test.c
@@ -1463,6 +1463,7 @@ ISC_TEST_ENTRY_CUSTOM(privilege_drop, _setup, _teardown)
 ISC_TEST_ENTRY_CUSTOM(privileged_events, _setup, _teardown)
 ISC_TEST_ENTRY_CUSTOM(purge, _setup2, _teardown)
 ISC_TEST_ENTRY_CUSTOM(purgeevent, _setup2, _teardown)
+ISC_TEST_ENTRY_CUSTOM(purgerange, _setup2, _teardown)
 ISC_TEST_ENTRY_CUSTOM(task_shutdown, _setup4, _teardown)
 ISC_TEST_ENTRY_CUSTOM(task_exclusive, _setup4, _teardown)