diff --git a/arch/x86/vdso/vma.c b/arch/x86/vdso/vma.c
index 0c7997467be060e83600935ace3edb14c8a8aff8..32ca60c8157b3dd98e4a3bf789d93ee3092258a8 100644
--- a/arch/x86/vdso/vma.c
+++ b/arch/x86/vdso/vma.c
@@ -268,6 +268,7 @@ static void vsyscall_set_cpu(int cpu)
 		.dpl = 3,		/* Visible to user code */
 		.s = 1,			/* Not a system segment */
 		.p = 1,			/* Present */
+		.d = 1,			/* 32-bit */
 	};
 
 	write_gdt_entry(get_cpu_gdt_table(cpu), GDT_ENTRY_PER_CPU, &d, DESCTYPE_S);