diff --git a/firmware/chibios/os/hal/platforms/STM32/RTCv2/rtc_lld.c b/firmware/chibios/os/hal/platforms/STM32/RTCv2/rtc_lld.c
index a9c487f0d1..e6df4beecc 100644
--- a/firmware/chibios/os/hal/platforms/STM32/RTCv2/rtc_lld.c
+++ b/firmware/chibios/os/hal/platforms/STM32/RTCv2/rtc_lld.c
@@ -52,6 +52,8 @@ RTCDriver RTCD1;
 /* Driver local functions.                                                   */
 /*===========================================================================*/
 
+extern int lseTimeout;
+
 /**
  * @brief   Wait for synchronization of RTC registers with APB1 bus.
  * @details This function must be invoked before trying to read RTC registers.
@@ -60,7 +62,7 @@ RTCDriver RTCD1;
  */
 #define rtc_lld_apb1_sync() {                                                \
     int counter = 0;                                                         \
-	while ((RTCD1.id_rtc->ISR & RTC_ISR_RSF) == 0 && ++counter <LSE_TIMEOUT);\
+	while ((RTCD1.id_rtc->ISR & RTC_ISR_RSF) == 0 && ++counter <lseTimeout);\
 	}
 
 /**
diff --git a/firmware/hw_layer/hardware.cpp b/firmware/hw_layer/hardware.cpp
index 41e24f9621..339f400e8e 100644
--- a/firmware/hw_layer/hardware.cpp
+++ b/firmware/hw_layer/hardware.cpp
@@ -59,6 +59,9 @@ int maxNesting = 0;
 #if HAL_USE_SPI || defined(__DOXYGEN__)
 static bool isSpiInitialized[5] = { false, false, false, false, false };
 
+// todo: use larger value if LSE is available, make this a boardConfiguration option
+int lseTimeout = 0;
+
 /**
  * Only one consumer can use SPI bus at a given time
  */
diff --git a/firmware/rusefi.cpp b/firmware/rusefi.cpp
index 5803d3a620..fcc3cab748 100644
--- a/firmware/rusefi.cpp
+++ b/firmware/rusefi.cpp
@@ -298,5 +298,5 @@ int getRusEfiVersion(void) {
 		return 123; // this is here to make the compiler happy about the unused array
 	if (UNUSED_CCM_SIZE[0] * 0 != 0)
 		return 3211; // this is here to make the compiler happy about the unused array
-	return 20160426;
+	return 20160503;
 }