diff --git a/firmware/rusefi.cpp b/firmware/rusefi.cpp
index 913222b023..1e7dcc0916 100644
--- a/firmware/rusefi.cpp
+++ b/firmware/rusefi.cpp
@@ -241,7 +241,7 @@ void chDbgStackOverflowPanic(thread_t *otp) {
 	chDbgPanic3(panicMessage, __FILE__, __LINE__);
 }
 
-static char UNUSED_RAM_SIZE[21100];
+static char UNUSED_RAM_SIZE[20100];
 
 static char UNUSED_CCM_SIZE[9500] CCM_OPTIONAL;