diff --git a/pdbApp/pvif.cpp b/pdbApp/pvif.cpp
index e3d27f3..59c746a 100644
--- a/pdbApp/pvif.cpp
+++ b/pdbApp/pvif.cpp
@@ -10,6 +10,7 @@
 #include <dbLock.h>
 #include <dbEvent.h>
 #include <alarm.h>
+#include <errMdef.h>
 
 #include <pv/bitSet.h>
 #include <pv/pvData.h>