diff --git a/src/libCom/osi/os/posix/osdSignal.c b/src/libCom/osi/os/posix/osdSignal.c
index b1cfa03f6..6a670ebab 100644
--- a/src/libCom/osi/os/posix/osdSignal.c
+++ b/src/libCom/osi/os/posix/osdSignal.c
@@ -16,6 +16,7 @@
 #define epicsExportSharedSymbols
 #include "epicsThread.h"
 #include "epicsSignal.h"
+#include "errlog.h"
 
 typedef void ( *pSigFunc ) ( int );