diff --git a/lib/std/zig/llvm/Builder.zig b/lib/std/zig/llvm/Builder.zig
index f7a217159e34060f6e5373e73e3a0808307df518..080e98b7ad13704fbf457aab34aa984e75b27744 100644
--- a/lib/std/zig/llvm/Builder.zig
+++ b/lib/std/zig/llvm/Builder.zig
@@ -508,7 +508,7 @@ pub const DataLayout = struct {
                 "E-m:e-p:64:64-i64:64-i128:128-n32:64-S128",
             .sparc => "E-m:e-p:32:32-i64:64-i128:128-f128:64-n32-S64",
             .sparc64 => "E-m:e-i64:64-i128:128-n32:64-S128",
-            .s390x => "E-m:e-i1:8:16-i8:8:16-i64:64-f128:64-v128:64-a:8:16-n32:64",
+            .s390x => "E-S64-m:e-i1:8:16-i8:8:16-i64:64-f128:64-v128:64-a:8:16-n32:64",
             .x86 => if (target.os.tag == .windows or target.os.tag == .uefi) switch (target.abi) {
                 .gnu => if (target.ofmt == .coff)
                     "e-m:x-p:32:32-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:32-n8:16:32-a:0:32-S32"