1 files changed, 6 insertions, 1 deletions
diff --git a/x86/gdbstub_sys.h b/x86/gdbstub_sys.h
index 639e8bd..82f7ca9 100644
--- a/x86/gdbstub_sys.h
+++ b/x86/gdbstub_sys.h
@@ -20,6 +20,9 @@
  * SOFTWARE.
  */
 
+#ifndef _GDBSTUB_SYS_H_
+#define _GDBSTUB_SYS_H_
+
 /* Define the size_t type */
 #define DBG_DEFINE_SIZET 1
 
@@ -130,4 +133,6 @@ void dbg_interrupt(struct dbg_interrupt_state *istate);
 void dbg_start(void);
 void dbg_io_write_8(uint16_t port, uint8_t val);
 uint8_t dbg_io_read_8(uint16_t port);
-void *dbg_sys_memset(void *ptr, int data, size_t len);
-\ No newline at end of file
+void *dbg_sys_memset(void *ptr, int data, size_t len);
+
+#endif