diff --git a/src/who-users.c b/src/who-users.c
index 2cc153bd0..cca8b52cc 100644
--- a/src/who-users.c
+++ b/src/who-users.c
@@ -55,15 +55,24 @@
 #define WTMP_FILE _PATH_WTMP
 #endif
 
-#if defined (UTMPX_FILE)	/* Solaris, SysVr4 */
-#undef  UTMP_FILE
+#ifdef UTMPX_FILE /* Solaris, SysVr4 */
+#undef UTMP_FILE
 #define UTMP_FILE UTMPX_FILE
 #endif
 
+#ifdef WTMPX_FILE /* Solaris, SysVr4 */
+#undef WTMP_FILE
+#define WTMP_FILE WTMPX_FILE
+#endif
+
 #ifndef UTMP_FILE
 #define UTMP_FILE "/etc/utmp"
 #endif
 
+#ifndef WTMP_FILE
+#define WTMP_FILE "/etc/wtmp"
+#endif
+
 #ifndef MAXHOSTNAMELEN
 #define MAXHOSTNAMELEN 64
 #endif