diff --git a/include/lib/smcc.h b/include/lib/smcc.h
index 2f562c5..a4c4b6c 100644
--- a/include/lib/smcc.h
+++ b/include/lib/smcc.h
@@ -58,6 +58,7 @@
 
 #define SMC_64				1
 #define SMC_32				0
+#define SMC_OK				0
 #define SMC_UNK				0xffffffff
 #define SMC_TYPE_FAST			ULL(1)
 #define SMC_TYPE_STD			0