diff --git a/libraries/IRremote/src/private/IRTimer.hpp b/libraries/IRremote/src/private/IRTimer.hpp
index f064e04..ad1db69 100644
--- a/libraries/IRremote/src/private/IRTimer.hpp
+++ b/libraries/IRremote/src/private/IRTimer.hpp
@@ -2078,9 +2078,12 @@ extern "C" void __attribute__((noinline, section(".ram_text"), optimize("O3")))
 
 #  if (defined(ARDUINO_START_MIK32_V1) || defined(ARDUINO_ELSOMIK))
 #define IR_SEND_PIN     P0_0
-#  else
+#  elif (defined(ARDUINO_ACE_UNO_8MB) || defined(ARDUINO_ACE_UNO_16MB) || \
+ defined(ARDUINO_ACE_UNO_32MB) || defined(ARDUINO_ELBEAR_NANO))
 #define IR_SEND_PIN     3
-#  endif    // START_MIK32_V1, ELSOMIK
+#  else
+#error "Unknown MIK32V2 board!"
+#  endif
 
 static TIMER32_HandleTypeDef            ir_sender_htimer;
 static TIMER32_CHANNEL_HandleTypeDef    ir_sender_htimer_channel;