diff --git a/lib/std/os/linux/riscv32.zig b/lib/std/os/linux/riscv32.zig
index 219eb5cc191e6f352a0d21a17c26c795f67e8b9d..b8023c5d5c7bfe5f9371883e05341f79020511ab 100644
--- a/lib/std/os/linux/riscv32.zig
+++ b/lib/std/os/linux/riscv32.zig
@@ -188,7 +188,10 @@ pub const Elf_Symndx = u32;
 
 pub const MMAP2_UNIT = 4096;
 
-pub const VDSO = struct {};
+pub const VDSO = struct {
+    pub const CGT_SYM = "__vdso_clock_gettime";
+    pub const CGT_VER = "LINUX_4.15";
+};
 
 /// TODO
 pub const ucontext_t = void;
diff --git a/lib/std/os/linux/riscv64.zig b/lib/std/os/linux/riscv64.zig
index fc0893d5c15408dd2b22eb72bc77bd9ee01d9799..8c3c8fe289115cce1a27461923bd950295ed16bc 100644
--- a/lib/std/os/linux/riscv64.zig
+++ b/lib/std/os/linux/riscv64.zig
@@ -215,7 +215,10 @@ pub const Stat = extern struct {
 
 pub const Elf_Symndx = u32;
 
-pub const VDSO = struct {};
+pub const VDSO = struct {
+    pub const CGT_SYM = "__vdso_clock_gettime";
+    pub const CGT_VER = "LINUX_4.15";
+};
 
 /// TODO
 pub const ucontext_t = void;