diff --git a/include/limits.h b/include/limits.h
index 25773ee464db3ba0424c80c919789ee3950c5327..e354ee73204c6eb31371bcf77ed5ddb8febc18af 100644
--- a/include/limits.h
+++ b/include/limits.h
@@ -63,6 +63,7 @@
 #define SEM_NSEMS_MAX 256
 #define DELAYTIMER_MAX 0x7fffffff
 #define MQ_PRIO_MAX 32768
+#define LOGIN_NAME_MAX 256
 
 /* Arbitrary numbers... */