diff --git a/src/FreeRTOSConfig.h b/src/FreeRTOSConfig.h
index cf18f4189e..8ce2eb4f55 100644
--- a/src/FreeRTOSConfig.h
+++ b/src/FreeRTOSConfig.h
@@ -62,7 +62,7 @@
 #define configTICK_RATE_HZ                      1024
 #define configMAX_PRIORITIES                    (3)
 #define configMINIMAL_STACK_SIZE                (120)
-#define configTOTAL_HEAP_SIZE                   (1024 * 40)
+#define configTOTAL_HEAP_SIZE                   (1024 * 39)
 #define configMAX_TASK_NAME_LEN                 (4)
 #define configUSE_16_BIT_TICKS                  0
 #define configIDLE_SHOULD_YIELD                 1