diff --git a/configure.ac b/configure.ac
index 001fd3da..2cf9a190 100644
--- a/configure.ac
+++ b/configure.ac
@@ -53,7 +53,7 @@ AC_USE_SYSTEM_EXTENSIONS
 AC_SYS_LARGEFILE
 AC_FUNC_ALLOCA
 
-AC_CHECK_HEADERS([sys/mkdev.h])
+AC_CHECK_HEADERS([sys/mkdev.h sys/sysctl.h])
 
 # Initialize libtool
 LT_PREREQ([2.2])
diff --git a/xf86drmMode.c b/xf86drmMode.c
index f4b8d146..529429e8 100644
--- a/xf86drmMode.c
+++ b/xf86drmMode.c
@@ -46,6 +46,9 @@
 #include <stdint.h>
 #include <stdlib.h>
 #include <sys/ioctl.h>
+#ifdef HAVE_SYS_SYSCTL_H
+#include <sys/sysctl.h>
+#endif
 #include <stdio.h>
 #include <stdbool.h>