diff --git a/engine/common/sha2.c b/engine/common/sha2.c
index d58bcdcff..5fb675f88 100644
--- a/engine/common/sha2.c
+++ b/engine/common/sha2.c
@@ -63,7 +63,7 @@
 #undef sha2_init
 #if SHA2==256
 	#define U64_C(n) (n##ull>>32)
-	#define U64_C_LOW(n) (u64)U64_C(n)
+	#define U64_C_LOW(n) (u64)(n##ull)
 	#define u64 quint32_t
 	#define ROUNDS 64
 	#define SHA2_CONTEXT SHA256_CONTEXT