diff --git a/qga/commands-posix.c b/qga/commands-posix.c
index ee997a58f2..7ab8d5eb3c 100644
--- a/qga/commands-posix.c
+++ b/qga/commands-posix.c
@@ -85,13 +85,23 @@ void qmp_guest_shutdown(bool has_mode, const char *mode, Error **errp)
     pid_t pid;
     int status;
 
+#ifdef CONFIG_SOLARIS
+    const char *powerdown_flag = "-i5";
+    const char *halt_flag = "-i0";
+    const char *reboot_flag = "-i6";
+#else
+    const char *powerdown_flag = "-P";
+    const char *halt_flag = "-H";
+    const char *reboot_flag = "-r";
+#endif
+
     slog("guest-shutdown called, mode: %s", mode);
     if (!has_mode || strcmp(mode, "powerdown") == 0) {
-        shutdown_flag = "-P";
+        shutdown_flag = powerdown_flag;
     } else if (strcmp(mode, "halt") == 0) {
-        shutdown_flag = "-H";
+        shutdown_flag = halt_flag;
     } else if (strcmp(mode, "reboot") == 0) {
-        shutdown_flag = "-r";
+        shutdown_flag = reboot_flag;
     } else {
         error_setg(errp,
                    "mode is invalid (valid values are: halt|powerdown|reboot");
@@ -106,8 +116,13 @@ void qmp_guest_shutdown(bool has_mode, const char *mode, Error **errp)
         reopen_fd_to_null(1);
         reopen_fd_to_null(2);
 
+#ifdef CONFIG_SOLARIS
+        execl("/sbin/shutdown", "shutdown", shutdown_flag, "-g0", "-y",
+              "hypervisor initiated shutdown", (char *)NULL);
+#else
         execl("/sbin/shutdown", "shutdown", "-h", shutdown_flag, "+0",
                "hypervisor initiated shutdown", (char *)NULL);
+#endif
         _exit(EXIT_FAILURE);
     } else if (pid < 0) {
         error_setg_errno(errp, errno, "failed to create child process");