diff --git a/configure.ac b/configure.ac
index e86aedf0..3cd8d63c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -79,6 +79,7 @@ AC_CHECK_HEADERS([net/route.h], [], AC_MSG_ERROR([Required header not found]), [
 # Checks for optional header files.
 AC_CHECK_HEADERS([ \
 libutil.h \
+linux/if_ppp.h \
 linux/if_tun.h \
 mach/mach.h \
 pty.h \
diff --git a/src/io.c b/src/io.c
index 27c36780..4026dab0 100644
--- a/src/io.c
+++ b/src/io.c
@@ -34,15 +34,17 @@
 
 #include <unistd.h>
 #include <arpa/inet.h>
-#include <linux/if_ppp.h>
 #include <netinet/tcp.h>
 #include <sys/ioctl.h>
 
-
 #include <errno.h>
 #include <signal.h>
 #include <string.h>
 
+#if HAVE_LINUX_IF_PPP_H
+#include <linux/if_ppp.h>
+#endif
+
 #if HAVE_MACH_MACH_H
 /* this is typical for mach kernel used on Mac OS X */
 #include <mach/mach.h>