diff --git a/watch-faces/clock/close_enough_face.c b/watch-faces/clock/close_enough_face.c
index a0bdb6f4..cde6d28e 100644
--- a/watch-faces/clock/close_enough_face.c
+++ b/watch-faces/clock/close_enough_face.c
@@ -189,7 +189,7 @@ bool close_enough_face_loop(movement_event_t event, void *context) {
             char second_word[3];
             char third_word[3];
             if (five_minute_period == 0) { // "  HH OC",
-                sprintf(first_word, "  ", 3);
+                sprintf(first_word, "  ");
                 sprintf(second_word, "%2d", close_enough_hour);
                 strncpy(third_word, oclock_word, 3);
             } else { // "MM P HH" or "MM 2 HH+1"
diff --git a/watch-faces/complication/kitchen_conversions_face.c b/watch-faces/complication/kitchen_conversions_face.c
index 7428de3b..c75239fb 100644
--- a/watch-faces/complication/kitchen_conversions_face.c
+++ b/watch-faces/complication/kitchen_conversions_face.c
@@ -233,7 +233,7 @@ static void display(kitchen_conversions_state_t *state, uint8_t subsec)
     case input:
     {
         char buf[7];
-        sprintf(buf, "%06u", state->selection_value);
+        sprintf(buf, "%06lu", state->selection_value);
         watch_display_text(WATCH_POSITION_BOTTOM, buf);
 
         // Only allow ints for Gas Mk
@@ -278,7 +278,7 @@ static void display(kitchen_conversions_state_t *state, uint8_t subsec)
         {
             uint32_t rounded = conversion + .5;
             char buf[7];
-            sprintf(buf, "%6u", rounded);
+            sprintf(buf, "%6lu", rounded);
             watch_display_text(WATCH_POSITION_BOTTOM, buf);
 
             // Make sure LSDs always filled
diff --git a/watch-faces/complication/tarot_face.c b/watch-faces/complication/tarot_face.c
index ea420281..c10b7710 100644
--- a/watch-faces/complication/tarot_face.c
+++ b/watch-faces/complication/tarot_face.c
@@ -33,8 +33,6 @@
 #include <string.h>
 #include "tarot_face.h"
 
-uint32_t arc4random_uniform(uint32_t upper_bound);
-
 #define TAROT_ANIMATION_TICK_FREQUENCY 8
 #define FLIPPED_BIT_POS 7
 #define FLIPPED_MASK ((uint8_t)(1 << FLIPPED_BIT_POS))
diff --git a/watch-library/shared/watch/watch.h b/watch-library/shared/watch/watch.h
index c6a81dd3..d2d8ba1d 100644
--- a/watch-library/shared/watch/watch.h
+++ b/watch-library/shared/watch/watch.h
@@ -89,3 +89,8 @@ void watch_reset_to_bootloader(void);
  *  FIXME: find a better place for this, a couple of watch faces need it.
  */
 void watch_disable_TRNG(void);
+
+#ifndef arc4random_uniform
+// not sure why this definition is missing but let's put it here for now
+uint32_t arc4random_uniform(uint32_t upper_bound);
+#endif