diff --git a/Sming/Arch/Esp8266/Platform/RTC.cpp b/Sming/Arch/Esp8266/Platform/RTC.cpp
index 5969cbf2a6..b06db69d65 100644
--- a/Sming/Arch/Esp8266/Platform/RTC.cpp
+++ b/Sming/Arch/Esp8266/Platform/RTC.cpp
@@ -14,7 +14,7 @@
 RtcClass RTC;
 
 #define RTC_MAGIC 0x55aaaa55
-#define RTC_DES_ADDR 64
+#define RTC_DES_ADDR 64 + 3 ///< rBoot may require 3 words at start
 #define NS_PER_SECOND 1000000000
 
 /** @brief  Structure to hold RTC data
diff --git a/Sming/Components/rboot/component.mk b/Sming/Components/rboot/component.mk
index 3a99722dfc..7a88aac668 100644
--- a/Sming/Components/rboot/component.mk
+++ b/Sming/Components/rboot/component.mk
@@ -120,7 +120,7 @@ endif
 
 ifeq ($(RBOOT_RTC_ENABLED),1)
 	# enable the temporary switch to rom feature
-	APP_CFLAGS			+= -DBOOT_RTC_ENABLED
+	GLOBAL_CFLAGS			+= -DBOOT_RTC_ENABLED
 endif
 
 ifeq ($(RBOOT_GPIO_ENABLED),1)
diff --git a/Sming/Libraries/Ota/component.mk b/Sming/Libraries/Ota/component.mk
index 964bde20cb..a06ea4d292 100644
--- a/Sming/Libraries/Ota/component.mk
+++ b/Sming/Libraries/Ota/component.mk
@@ -18,3 +18,5 @@ ifeq ($(COMPONENT_ARCH),Esp8266)
 endif
 
 COMPONENT_DOXYGEN_INPUT := src
+
+COMPONENT_RELINK_VARS += RBOOT_RTC_ENABLED
diff --git a/Sming/Libraries/Ota/src/Arch/Esp8266/RbootUpgrader.cpp b/Sming/Libraries/Ota/src/Arch/Esp8266/RbootUpgrader.cpp
index 50bbe5b372..b143b77126 100644
--- a/Sming/Libraries/Ota/src/Arch/Esp8266/RbootUpgrader.cpp
+++ b/Sming/Libraries/Ota/src/Arch/Esp8266/RbootUpgrader.cpp
@@ -50,7 +50,7 @@ bool RbootUpgrader::setBootPartition(Partition partition, bool save)
 {
 	uint8_t slot = getSlotForPartition(partition);
 	if(!save) {
-#ifdef RBOOT_ENABLE_RTC
+#ifdef BOOT_RTC_ENABLED
 		return rboot_set_temp_rom(slot);
 #else
 		return false;
@@ -63,7 +63,7 @@ bool RbootUpgrader::setBootPartition(Partition partition, bool save)
 Partition RbootUpgrader::getRunningPartition()
 {
 	uint8_t slot = rboot_get_current_rom();
-#ifdef RBOOT_ENABLE_RTC
+#ifdef BOOT_RTC_ENABLED
 	rboot_rtc_data rtc;
 	if(rboot_get_rtc_data(&rtc) && rtc.last_mode == MODE_TEMP_ROM) {
 		slot = rtc.last_rom;