diff --git a/lib/std/c.zig b/lib/std/c.zig
index e4d123965d586f5fff53e680246a5f310ff33456..6969f4df8a4b1f3be8daf11923312c2f9a7c8a52 100644
--- a/lib/std/c.zig
+++ b/lib/std/c.zig
@@ -11294,7 +11294,7 @@ else if (native_os.isDarwin())
     c_longdouble
 else
     extern struct {
-        a: c_longlong,
+        a: c_longlong align(if (native_arch == .x86) 8 else @alignOf(c_longlong)),
         b: c_longdouble,
     };