diff --git a/include/digio_prj.h b/include/digio_prj.h
index fb048a2..64c4af7 100644
--- a/include/digio_prj.h
+++ b/include/digio_prj.h
@@ -38,6 +38,7 @@
     DIG_IO_ENTRY(ocur_in,     GPIOD, GPIO15, PinMode::INPUT_FLT) /* non-existant */  \
     DIG_IO_ENTRY(desat_in,    GPIOD, GPIO15, PinMode::INPUT_FLT) /* non-existant */  \
     DIG_IO_ENTRY(dcsw_out,    GPIOC, GPIO15, PinMode::OUTPUT)      \
+    DIG_IO_ENTRY(fan_out,     GPIOA, GPIO0,  PinMode::OUTPUT)  /* map to unused pin by default */    \
     DIG_IO_ENTRY(vtg_out,     GPIOD, GPIO14, PinMode::OUTPUT) /* non-existant */     \
     DIG_IO_ENTRY(prec_out,    GPIOB, GPIO4,  PinMode::OUTPUT)      \
     DIG_IO_ENTRY(led_out,     GPIOC, GPIO13, PinMode::OUTPUT)      \
diff --git a/test/test_vcu.cpp b/test/test_vcu.cpp
index 0657c22..c7c3c6d 100644
--- a/test/test_vcu.cpp
+++ b/test/test_vcu.cpp
@@ -195,6 +195,7 @@ DigIo DigIo::brk_out;
 DigIo DigIo::dcsw_out;
 DigIo DigIo::prec_out;
 DigIo DigIo::vtg_out;
+DigIo DigIo::fan_out;
 DigIo DigIo::temp0_out;
 DigIo DigIo::cruise_in;
 DigIo DigIo::start_in;