diff --git a/src/who.c b/src/who.c
index 55733b4..3ad4774 100644
--- a/src/who.c
+++ b/src/who.c
@@ -81,7 +81,7 @@
 # define UT_TYPE_NEW_TIME(U) false
 #endif
 
-#define IDLESTR_LEN 6
+#define IDLESTR_LEN 10
 
 #if HAVE_STRUCT_XTMP_UT_PID
 # define PIDSTR_DECL_AND_INIT(Var, Utmp_ent) \