diff --git a/ChangeLog b/ChangeLog
index c436dc30..3ae48113 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -2,6 +2,7 @@ Thu 01 Apr 2021 21:29:46 MSK
     Fixed MD5 digest authorization broken when compiled without variable
     length arrays support (notably with MSVC).
     Fixed and muted compiler warning.
+    Deeper test with zzuf if configured with --enable-heavy-tests.
     Removed run-check of assert() in configure to avoid core dumps. -EG
 
 Thu 01 Apr 2021 17:46:00 MSK
diff --git a/src/include/microhttpd.h b/src/include/microhttpd.h
index a4ba9bf1..5eda9845 100644
--- a/src/include/microhttpd.h
+++ b/src/include/microhttpd.h
@@ -2726,7 +2726,7 @@ MHD_run (struct MHD_Daemon *daemon);
  * @note Available since #MHD_VERSION 0x00097206
  * @ingroup event
  */
-enum MHD_Result
+_MHD_EXTERN enum MHD_Result
 MHD_run_wait (struct MHD_Daemon *daemon,
               int32_t millisec);
 
diff --git a/src/microhttpd/daemon.c b/src/microhttpd/daemon.c
index 59eaf953..7f814ec0 100644
--- a/src/microhttpd/daemon.c
+++ b/src/microhttpd/daemon.c
@@ -5094,7 +5094,7 @@ MHD_run (struct MHD_Daemon *daemon)
  * @note Available since #MHD_VERSION 0x00097206
  * @ingroup event
  */
-enum MHD_Result
+_MHD_EXTERN enum MHD_Result
 MHD_run_wait (struct MHD_Daemon *daemon,
               int32_t millisec)
 {