diff --git a/libs/ardour/vst2_scan.cc b/libs/ardour/vst2_scan.cc
index f6c6f094cc..b2b45ae169 100644
--- a/libs/ardour/vst2_scan.cc
+++ b/libs/ardour/vst2_scan.cc
@@ -45,6 +45,7 @@
 #include "pbd/basename.h"
 #include "pbd/error.h"
 #include "pbd/failed_constructor.h"
+#include "pbd/localtime_r.h"
 
 #include "ardour/filesystem_paths.h"
 #include "ardour/linux_vst_support.h"
diff --git a/libs/ardour/vst3_scan.cc b/libs/ardour/vst3_scan.cc
index d21551b36b..e703221d60 100644
--- a/libs/ardour/vst3_scan.cc
+++ b/libs/ardour/vst3_scan.cc
@@ -37,6 +37,7 @@
 #include "pbd/basename.h"
 #include "pbd/error.h"
 #include "pbd/failed_constructor.h"
+#include "pbd/localtime_r.h"
 
 #include "ardour/filesystem_paths.h"
 #include "ardour/vst3_module.h"