diff --git a/include/configs/sheevaplug.h b/include/configs/sheevaplug.h
index 23dd5ce..dc63758 100644
--- a/include/configs/sheevaplug.h
+++ b/include/configs/sheevaplug.h
@@ -44,6 +44,11 @@
 #define CONFIG_ENV_SIZE			0x20000	/* 128k */
 #define CONFIG_ENV_ADDR			0x80000
 #define CONFIG_ENV_OFFSET		0x80000	/* env starts here */
+/*
+ * Environment is right behind U-Boot in flash. Make sure U-Boot
+ * doesn't grow into the environment area.
+ */
+#define CONFIG_BOARD_SIZE_LIMIT		CONFIG_ENV_OFFSET
 
 /*
  * Default environment variables