diff --git a/lib/std/os/linux.zig b/lib/std/os/linux.zig
index 4e1dd8cda3..90091ac574 100644
--- a/lib/std/os/linux.zig
+++ b/lib/std/os/linux.zig
@@ -1397,7 +1397,7 @@ const VdsoClockGettime = *align(1) const fn (clockid_t, *timespec) callconv(.C)
 var vdso_clock_gettime: ?VdsoClockGettime = &init_vdso_clock_gettime;
 
 pub fn clock_gettime(clk_id: clockid_t, tp: *timespec) usize {
-    if (@hasDecl(VDSO, "CGT_SYM")) {
+    if (VDSO != void) {
         const ptr = @atomicLoad(?VdsoClockGettime, &vdso_clock_gettime, .unordered);
         if (ptr) |f| {
             const rc = f(clk_id, tp);
diff --git a/lib/std/os/linux/mips.zig b/lib/std/os/linux/mips.zig
index abf047e838..853df45fce 100644
--- a/lib/std/os/linux/mips.zig
+++ b/lib/std/os/linux/mips.zig
@@ -242,8 +242,8 @@ pub const F = struct {
 pub const MMAP2_UNIT = 4096;
 
 pub const VDSO = struct {
-    pub const CGT_SYM = "__kernel_clock_gettime";
-    pub const CGT_VER = "LINUX_2.6.39";
+    pub const CGT_SYM = "__vdso_clock_gettime";
+    pub const CGT_VER = "LINUX_2.6";
 };
 
 pub const Flock = extern struct {
diff --git a/lib/std/os/linux/mips64.zig b/lib/std/os/linux/mips64.zig
index 9be0f41c4f..5089ba6fd3 100644
--- a/lib/std/os/linux/mips64.zig
+++ b/lib/std/os/linux/mips64.zig
@@ -227,8 +227,8 @@ pub const F = struct {
 pub const MMAP2_UNIT = 4096;
 
 pub const VDSO = struct {
-    pub const CGT_SYM = "__kernel_clock_gettime";
-    pub const CGT_VER = "LINUX_2.6.39";
+    pub const CGT_SYM = "__vdso_clock_gettime";
+    pub const CGT_VER = "LINUX_2.6";
 };
 
 pub const Flock = extern struct {
diff --git a/lib/std/os/linux/riscv32.zig b/lib/std/os/linux/riscv32.zig
index 219eb5cc19..b8023c5d5c 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 fc0893d5c1..8c3c8fe289 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;