diff --git a/harbour/ChangeLog.txt b/harbour/ChangeLog.txt
index 65fa5f53fe..b460d94b28 100644
--- a/harbour/ChangeLog.txt
+++ b/harbour/ChangeLog.txt
@@ -10,6 +10,11 @@
      * Change, ! Fix, % Optimization, + Addition, - Removal, ; Comment
  */
 
+2012-12-04 00:59 UTC+0100 Viktor Szakats (harbour syenar.net)
+  * extras/hbusb/hbusb.ch
+  * extras/hbvpdf/hbvpdf.ch
+    ! missing self-guards for standard headers
+
 2012-12-04 00:51 UTC+0100 Viktor Szakats (harbour syenar.net)
   * contrib/hbrun/hbrun.hbp
   * utils/hbmk2/hbmk2.prg
diff --git a/harbour/extras/hbusb/hbusb.ch b/harbour/extras/hbusb/hbusb.ch
index 02d47484c7..f41be76278 100644
--- a/harbour/extras/hbusb/hbusb.ch
+++ b/harbour/extras/hbusb/hbusb.ch
@@ -2,9 +2,14 @@
  * $Id$
  */
 
+#ifndef HBUSB_CH
+#define HBUSB_CH
+
 #define LIBUSB_UNREF_DEVICES        1
 
 #define LIBUSB_KERNEL_HAS_INTERFACE 1
 
 #define LIBUSB_ENDPOINT_IN          129 /* Should be 128 and then && 1 when required */
 #define LIBUSB_ENDPOINT_OUT         0
+
+#endif
diff --git a/harbour/extras/hbvpdf/hbvpdf.ch b/harbour/extras/hbvpdf/hbvpdf.ch
index 19778939b2..0dc76a8042 100644
--- a/harbour/extras/hbvpdf/hbvpdf.ch
+++ b/harbour/extras/hbvpdf/hbvpdf.ch
@@ -2,6 +2,9 @@
  * $Id$
  */
 
+#ifndef HBVPDF_CH
+#define HBVPDF_CH
+
 #define NORMAL        0
 #define BOLD          1
 #define ITALIC        2
@@ -221,3 +224,5 @@
 #define pdf_WHITESMOKE           "F5F5F5"
 #define pdf_YELLOW               "FFFF00"
 #define pdf_YELLOWGREEN          "9ACD32"
+
+#endif