diff --git a/firmware/config/boards/hellen/harley81/board.mk b/firmware/config/boards/hellen/harley81/board.mk
index eb6e98bec5..94d5179be1 100644
--- a/firmware/config/boards/hellen/harley81/board.mk
+++ b/firmware/config/boards/hellen/harley81/board.mk
@@ -19,3 +19,6 @@ include $(BOARDS_DIR)/hellen/hellen-common144.mk
 DDEFS += $(PRIMARY_COMMUNICATION_PORT_USART2)
 
 DDEFS += -DSHORT_BOARD_NAME=harley81
+
+# temp workaround of https://github.com/rusefi/rusefi/issues/4084
+DDEFS += -DHW_HELLEN_SKIP_BOARD_TYPE=TRUE
diff --git a/firmware/config/engines/custom_engine.cpp b/firmware/config/engines/custom_engine.cpp
index 9550749c72..243efde3f7 100644
--- a/firmware/config/engines/custom_engine.cpp
+++ b/firmware/config/engines/custom_engine.cpp
@@ -999,7 +999,7 @@ end
 }
 
 void detectBoardType() {
-#if HW_HELLEN
+#if HW_HELLEN && !defined(HW_HELLEN_SKIP_BOARD_TYPE)
 #if !EFI_UNIT_TEST
 	detectHellenBoardType();
 #endif /* EFI_UNIT_TEST */