diff --git a/lib/std/Thread.zig b/lib/std/Thread.zig
index 25f9146bb0aa6ce8cb6ae4d3744788002bdf2413..475587c40ccbd32858ff6ca885ccf47deedf6637 100644
--- a/lib/std/Thread.zig
+++ b/lib/std/Thread.zig
@@ -1411,6 +1411,16 @@ const LinuxThreadImpl = struct {
                     : [ptr] "{r4}" (@intFromPtr(self.mapped.ptr)),
                       [len] "{r5}" (self.mapped.len),
                     : .{ .memory = true }),
+                .csky => asm volatile (
+                    \\ movi r7, 215 # SYS_munmap
+                    \\ trap 0
+                    \\ movi r7, 93 # SYS_exit
+                    \\ movi r0, 0
+                    \\ trap 0
+                    :
+                    : [ptr] "{r0}" (@intFromPtr(self.mapped.ptr)),
+                      [len] "{r1}" (self.mapped.len),
+                    : .{ .memory = true }),
                 .xtensa, .xtensaeb => asm volatile (
                     \\ movi a2, 81 // SYS_munmap
                     \\ syscall