diff --git a/wiringPi/wiringPi.c b/wiringPi/wiringPi.c
index a902083..25c957c 100644
--- a/wiringPi/wiringPi.c
+++ b/wiringPi/wiringPi.c
@@ -494,7 +494,7 @@ static int physToSysGPIOPi5 [41] =
   _0v, 420, //39, 40
 } ;
 
-static int GPIOToSysFS(const int pin) {
+int GPIOToSysFS(const int pin) {
   int sysfspin =  pin;
   if (RaspberryPiModel<0) { //need to detect pi model
     int   model, rev, mem, maker, overVolted ;
diff --git a/wiringPi/wiringPi.h b/wiringPi/wiringPi.h
index ff088ca..0f5cd1c 100644
--- a/wiringPi/wiringPi.h
+++ b/wiringPi/wiringPi.h
@@ -203,6 +203,8 @@ extern int wiringPiFailure (int fatal, const char *message, ...) ;
 extern struct wiringPiNodeStruct *wiringPiFindNode (int pin) ;
 extern struct wiringPiNodeStruct *wiringPiNewNode  (int pinBase, int numPins) ;
 
+extern int GPIOToSysFS(const int pin) ;
+
 extern void wiringPiVersion	(int *major, int *minor) ;
 extern int  wiringPiSetup       (void) ;
 extern int  wiringPiSetupSys    (void) ;