diff --git a/lib/compiler/aro/aro/TypeStore.zig b/lib/compiler/aro/aro/TypeStore.zig
index d4aa4c2506..26c4f5a158 100644
--- a/lib/compiler/aro/aro/TypeStore.zig
+++ b/lib/compiler/aro/aro/TypeStore.zig
@@ -2196,6 +2196,7 @@ fn generateVaListType(ts: *TypeStore, comp: *Compilation) !QualType {
         else
             return .char_pointer,
         .powerpc, .powerpcle => .powerpc_va_list,
+        .s390x => .s390x_va_list,
         .x86_64 => switch (comp.target.os.tag) {
             .uefi, .windows => return .char_pointer,
             else => .x86_64_va_list,