inttypes are not handled correctly (PRIu8)

This sketch demonstrates printing to a string using defines of inttypes.h. The PRIu8 isn't interpreted correctly.

void setup() {
  Serial.begin(115200);
}

void loop() {
  char fmtBuffer[400];
  snprintf(fmtBuffer, sizeof(fmtBuffer), "hu=%hu PRIu8=%" PRIu8 " PRIu16=%" PRIu16 " PRIu32=%" PRIu32, 1, 1, 1, 1);
  Serial.println(fmtBuffer);
}

Output is: hu=1 PRIu8=hu PRIu16=1 PRIu32=1