diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index 9b12fe7..27db8da 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -401,6 +401,9 @@
 #endif
 	return 0;
 }
+#ifndef SUPPORT_SYSRQ
+#define uart_handle_sysrq_char(port,ch,regs) uart_handle_sysrq_char(port, 0, NULL)
+#endif
 
 /*
  * We do the SysRQ and SAK checking like this...