diff --git a/src/uefi/uefirtvariable/uefirtvariable.c b/src/uefi/uefirtvariable/uefirtvariable.c
index 1599c5b..2a9db0b 100644
--- a/src/uefi/uefirtvariable/uefirtvariable.c
+++ b/src/uefi/uefirtvariable/uefirtvariable.c
@@ -41,7 +41,7 @@
 }
 
 #define EFI_SUCCESS		0
-#define EFI_NOT_FOUND		(14 | (1UL << 63))
+#define EFI_NOT_FOUND		(14 | (1ULL << 63))
 
 #define MAX_DATA_LENGTH		1024