diff --git a/libraries/AP_Semaphore/examples/AP_Semaphore_test/AP_Semaphore_test.pde b/libraries/AP_Semaphore/examples/AP_Semaphore_test/AP_Semaphore_test.pde
index 059506051f..277e76f313 100644
--- a/libraries/AP_Semaphore/examples/AP_Semaphore_test/AP_Semaphore_test.pde
+++ b/libraries/AP_Semaphore/examples/AP_Semaphore_test/AP_Semaphore_test.pde
@@ -7,6 +7,7 @@
 FastSerialPort0(Serial);
 
 AP_Semaphore my_semaphore;
+AP_Semaphore AP_Semaphore_spi3;
 
 int16_t dummy1, dummy2, dummy3; // used to provide points to semaphore library