--- shellinabox/launcher.c
+++ shellinabox/launcher.c
@@ -595,7 +595,7 @@
   return utmp;
 }
 
-#if defined(HAVE_UPDWTMP) && !defined(HAVE_UPDWTMPX)
+#if defined(HAVE_UTMPX_H) && defined(HAVE_UPDWTMP) && !defined(HAVE_UPDWTMPX)
 #define min(a,b) ({ typeof(a) _a=(a); typeof(b) _b=(b); _a < _b ? _a : _b; })
 #define updwtmpx x_updwtmpx