diff --git a/ports/atmel-samd/common-hal/touchio/TouchIn.c b/ports/atmel-samd/common-hal/touchio/TouchIn.c
index 0677d5b3a1..eda1b72c43 100644
--- a/ports/atmel-samd/common-hal/touchio/TouchIn.c
+++ b/ports/atmel-samd/common-hal/touchio/TouchIn.c
@@ -114,7 +114,14 @@ void common_hal_touchio_touchin_deinit(touchio_touchin_obj_t* self) {
 }
 
 void touchin_reset() {
-    // TODO(tannewt): Reset the PTC.
+    Ptc* ptc = ((Ptc *) PTC);
+    if (ptc->CTRLA.bit.ENABLE == 1) {
+        ptc->CTRLA.bit.ENABLE = 0;
+        while (ptc->CTRLA.bit.ENABLE == 1) {}
+
+        ptc->CTRLA.bit.SWRESET = 1;
+        while (ptc->CTRLA.bit.SWRESET == 1) {}
+    }
 }
 
 bool common_hal_touchio_touchin_get_value(touchio_touchin_obj_t *self) {
diff --git a/ports/atmel-samd/supervisor/port.c b/ports/atmel-samd/supervisor/port.c
index 8e6f2b1857..cd122843de 100644
--- a/ports/atmel-samd/supervisor/port.c
+++ b/ports/atmel-samd/supervisor/port.c
@@ -53,6 +53,7 @@
 #include "common-hal/pulseio/PulseOut.h"
 #include "common-hal/pulseio/PWMOut.h"
 #include "common-hal/rtc/RTC.h"
+#include "common-hal/touchio/TouchIn.h"
 #include "common-hal/usb_hid/Device.h"
 #include "shared-bindings/rtc/__init__.h"
 #include "clocks.h"
@@ -240,8 +241,10 @@ void reset_port(void) {
     i2sout_reset();
     #endif
     audio_dma_reset();
-//     touchin_reset();
     //pdmin_reset();
+#endif
+#ifdef SAMD21
+    touchin_reset();
 #endif
     pulsein_reset();
     pulseout_reset();