diff --git a/include/utmp.h b/include/utmp.h
index 92519c2e..77b16c7a 100644
--- a/include/utmp.h
+++ b/include/utmp.h
@@ -8,7 +8,7 @@ extern "C" {
 #include <utmpx.h>
 
 #define ACCOUNTING 9
-#define UT_NAMESIZE 32
+#define UT_LINESIZE 12
 #define UT_HOSTSIZE 256
 
 #define ut_time ut_tv.tv_sec