diff --git a/src/ioc/db/dbUnitTest.c b/src/ioc/db/dbUnitTest.c
index dbd8c487e..3fac2a756 100644
--- a/src/ioc/db/dbUnitTest.c
+++ b/src/ioc/db/dbUnitTest.c
@@ -30,6 +30,7 @@
 #include "dbUnitTest.h"
 #include "initHooks.h"
 #include "iocInit.h"
+#include "errSymTbl.h"
 
 static dbEventCtx testEvtCtx;
 static epicsMutexId testEvtLock;