diff --git a/lib/std/c.zig b/lib/std/c.zig
index 69c29af84368b22df157932076f46198545e88f9..3f2fde449d5bc513c1786b2f5327ed0040b381d6 100644
--- a/lib/std/c.zig
+++ b/lib/std/c.zig
@@ -11496,7 +11496,7 @@ 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,
     };