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