diff --git a/src/add-ons/accelerants/radeon_hd/bios.h b/src/add-ons/accelerants/radeon_hd/bios.h
index 164e95a1e0..4d26848730 100644
--- a/src/add-ons/accelerants/radeon_hd/bios.h
+++ b/src/add-ons/accelerants/radeon_hd/bios.h
@@ -5,6 +5,8 @@
  * Authors:
  *		Alexander von Gluck IV, kallisti5@unixzen.com
  */
+#ifndef RADEON_HD_BIOS_H
+#define RADEON_HD_BIOS_H
 
 
 #include <stdint.h>
@@ -20,3 +22,5 @@ extern "C" {
 status_t AtomParser(void *parameterSpace, uint8_t index,
 	void *handle, void *biosBase);
 
+
+#endif /* RADEON_HD_BIOS_H */
diff --git a/src/add-ons/accelerants/radeon_hd/mode.h b/src/add-ons/accelerants/radeon_hd/mode.h
index a3f109b8cf..62942cae70 100644
--- a/src/add-ons/accelerants/radeon_hd/mode.h
+++ b/src/add-ons/accelerants/radeon_hd/mode.h
@@ -5,6 +5,8 @@
  * Authors:
  *		Alexander von Gluck, kallisti5@unixzen.com
  */
+#ifndef RADEON_HD_MODE_H
+#define RADEON_HD_MODE_H
 
 
 #include <create_display_modes.h>
@@ -15,3 +17,5 @@
 status_t create_mode_list(void);
 status_t mode_sanity_check(display_mode *mode);
 
+
+#endif /*RADEON_HD_MODE_H*/