diff --git a/extras/usb_id/usb_id.c b/extras/usb_id/usb_id.c
index 5b78b975d..92492c866 100644
--- a/extras/usb_id/usb_id.c
+++ b/extras/usb_id/usb_id.c
@@ -11,6 +11,8 @@
  *	Free Software Foundation version 2 of the License.
  */
 
+#include <config.h>
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdarg.h>
diff --git a/udev/udev_rules_parse.c b/udev/udev_rules_parse.c
index bf833bae5..705b3feb0 100644
--- a/udev/udev_rules_parse.c
+++ b/udev/udev_rules_parse.c
@@ -17,6 +17,8 @@
  *
  */
 
+#include "config.h"
+
 #include <stddef.h>
 #include <stdlib.h>
 #include <string.h>
diff --git a/udev/udev_sysdeps.c b/udev/udev_sysdeps.c
index ef5b09ef8..cd7d14839 100644
--- a/udev/udev_sysdeps.c
+++ b/udev/udev_sysdeps.c
@@ -21,6 +21,8 @@
 #include <string.h>
 #include <sys/types.h>
 
+#include "udev_sysdeps.h"
+
 #ifndef HAVE_STRLCPY
 size_t strlcpy(char *dst, const char *src, size_t size)
 {