diff --git a/include/pbl.h b/include/pbl.h
index d041a3f..787bd82 100644
--- a/include/pbl.h
+++ b/include/pbl.h
@@ -12,4 +12,10 @@
 
 void pbl_barebox_uncompress(void *dest, void *compressed_start, unsigned int len);
 
+#ifdef __PBL__
+#define IN_PBL	1
+#else
+#define IN_PBL	0
+#endif
+
 #endif /* __PBL_H__ */