diff --git a/lib/isc/tests/isctest.h b/lib/isc/tests/isctest.h
index 03423c807b..31c82c72b4 100644
--- a/lib/isc/tests/isctest.h
+++ b/lib/isc/tests/isctest.h
@@ -43,8 +43,8 @@ extern isc_mem_t *mctx;
 extern isc_entropy_t *ectx;
 extern isc_log_t *lctx;
 extern isc_taskmgr_t *taskmgr;
-isc_timermgr_t *timermgr;
-isc_socketmgr_t *socketmgr;
+extern isc_timermgr_t *timermgr;
+extern isc_socketmgr_t *socketmgr;
 extern int ncpus;
 
 isc_result_t