diff --git a/std/special/compiler_rt/index.zig b/std/special/compiler_rt/index.zig
index 7f80fd1e7c..73272706ab 100644
--- a/std/special/compiler_rt/index.zig
+++ b/std/special/compiler_rt/index.zig
@@ -101,30 +101,32 @@ export nakedcc fn __aeabi_uidivmod() {
 export nakedcc fn __chkstk() {
     @setDebugSafety(this, false);
 
-    if (comptime builtin.arch == builtin.Arch.x86_64) {
-        asm volatile (
-            \\         push   %%rcx
-            \\         cmp    $0x1000,%%rax
-            \\         lea    16(%%rsp),%%rcx     // rsp before calling this routine -> rcx
-            \\         jb     1f
-            \\ 2:
-            \\         sub    $0x1000,%%rcx
-            \\         test   %%rcx,(%%rcx)
-            \\         sub    $0x1000,%%rax
-            \\         cmp    $0x1000,%%rax
-            \\         ja     2b
-            \\ 1:
-            \\         sub    %%rax,%%rcx
-            \\         test   %%rcx,(%%rcx)
-            \\ 
-            \\         lea    8(%%rsp),%%rax     // load pointer to the return address into rax
-            \\         mov    %%rcx,%%rsp        // install the new top of stack pointer into rsp
-            \\         mov    -8(%%rax),%%rcx    // restore rcx
-            \\         push   (%%rax)           // push return address onto the stack
-            \\         sub    %%rsp,%%rax        // restore the original value in rax
-            \\         ret
-        );
-        unreachable;
+    if (comptime builtin.os == builtin.Os.windows) {
+        if (comptime builtin.arch == builtin.Arch.x86_64) {
+            asm volatile (
+                \\         push   %%rcx
+                \\         cmp    $0x1000,%%rax
+                \\         lea    16(%%rsp),%%rcx     // rsp before calling this routine -> rcx
+                \\         jb     1f
+                \\ 2:
+                \\         sub    $0x1000,%%rcx
+                \\         test   %%rcx,(%%rcx)
+                \\         sub    $0x1000,%%rax
+                \\         cmp    $0x1000,%%rax
+                \\         ja     2b
+                \\ 1:
+                \\         sub    %%rax,%%rcx
+                \\         test   %%rcx,(%%rcx)
+                \\ 
+                \\         lea    8(%%rsp),%%rax     // load pointer to the return address into rax
+                \\         mov    %%rcx,%%rsp        // install the new top of stack pointer into rsp
+                \\         mov    -8(%%rax),%%rcx    // restore rcx
+                \\         push   (%%rax)           // push return address onto the stack
+                \\         sub    %%rsp,%%rax        // restore the original value in rax
+                \\         ret
+            );
+            unreachable;
+        }
     }
 
     @setGlobalLinkage(__chkstk, builtin.GlobalLinkage.Internal);