diff --git a/grblHAL_Teensy4/platformio.ini b/grblHAL_Teensy4/platformio.ini
index 4c56cdf..e3cd840 100644
--- a/grblHAL_Teensy4/platformio.ini
+++ b/grblHAL_Teensy4/platformio.ini
@@ -19,6 +19,7 @@ framework     = arduino
 extra_scripts = ${common.extra_scripts}
 build_flags   = ${common.build_flags}
         -D INVERT_CONTROL_PIN_MASK=64
+        -D N_SPINDLE=8
 		-include src/my_machine.h
 lib_deps      = ${common.lib_deps}
 monitor_speed = 250000
diff --git a/grblHAL_Teensy4/src/spindle b/grblHAL_Teensy4/src/spindle
index d2bc839..2bc814e 160000
--- a/grblHAL_Teensy4/src/spindle
+++ b/grblHAL_Teensy4/src/spindle
@@ -1 +1 @@
-Subproject commit d2bc839fad61fddd19b5d24654c651c70d5fefb9
+Subproject commit 2bc814e1671fe32da0f00cfde14d5fc8148e6a08