diff --git a/src/libCom/errInc.c b/src/libCom/errInc.c
index ba9480c6a..6ed924050 100644
--- a/src/libCom/errInc.c
+++ b/src/libCom/errInc.c
@@ -4,6 +4,7 @@
 
 /* common to epics Unix and vxWorks */
 #include "dbAccess.h"
+#include "asLib.h"
 #include "sdrHeader.h"
 #include "drvSup.h"
 #include "devSup.h"