diff --git a/src/db/dbTest.c b/src/db/dbTest.c
index 83cfdaa32..0976bdb4e 100644
--- a/src/db/dbTest.c
+++ b/src/db/dbTest.c
@@ -17,6 +17,7 @@
 #include <stdio.h>
 
 #include "epicsStdio.h"
+#include "epicsString.h"
 #include "dbDefs.h"
 #include "errlog.h"
 #include "ellLib.h"