diff --git a/src/libCom/osi/os/posix/osdThread.c b/src/libCom/osi/os/posix/osdThread.c
index e3b16bd7a..007ae67fd 100644
--- a/src/libCom/osi/os/posix/osdThread.c
+++ b/src/libCom/osi/os/posix/osdThread.c
@@ -24,9 +24,10 @@
 #include <unistd.h>
 
 #include "ellLib.h"
-#include "epicsThread.h"
-#include "epicsMutex.h"
 #include "epicsEvent.h"
+#include "epicsMutex.h"
+#include "epicsString.h"
+#include "epicsThread.h"
 #include "cantProceed.h"
 #include "errlog.h"
 #include "epicsAssert.h"