diff --git a/sc2/src/libs/md5/md5.c b/sc2/src/libs/md5/md5.c
index 28ffe2e7a..d57b3dfe8 100644
--- a/sc2/src/libs/md5/md5.c
+++ b/sc2/src/libs/md5/md5.c
@@ -244,7 +244,7 @@ md5_process_bytes (const void *buffer, size_t len, struct md5_ctx *ctx)
   if (len >= 64)
     {
 #if !_STRING_ARCH_unaligned
-# define alignof(type) offsetof (struct { char c; type x; }, x)
+# define alignof(type) offsetof (struct align_ ## type { char c; type x; }, x)
 # define UNALIGNED_P(p) (((size_t) p) % alignof (uint32_t) != 0)
       if (UNALIGNED_P (buffer))
 	while (len > 64)