diff --git a/src/WINNT/aklog/aklog.c b/src/WINNT/aklog/aklog.c
index ee66000321..803d3f58f0 100644
--- a/src/WINNT/aklog/aklog.c
+++ b/src/WINNT/aklog/aklog.c
@@ -67,6 +67,7 @@
 #include <krb5.h>
 #include <afs/ptserver.h>
 #include <afs/ptuser.h>
+#include <afs/pterror.h>
 
 #ifdef WIN32
 #include <windows.h>