diff --git a/lib/std/Thread.zig b/lib/std/Thread.zig
index c299fb626c..cd019329d3 100644
--- a/lib/std/Thread.zig
+++ b/lib/std/Thread.zig
@@ -1288,6 +1288,18 @@ const LinuxThreadImpl = struct {
                     : [ptr] "r" (@intFromPtr(self.mapped.ptr)),
                       [len] "r" (self.mapped.len),
                     : .{ .memory = true }),
+                .or1k => asm volatile (
+                    \\ l.ori r11, r0, 215 # SYS_munmap
+                    \\ l.ori r3, %[ptr]
+                    \\ l.ori r4, %[len]
+                    \\ l.sys 1
+                    \\ l.ori r11, r0, 93 # SYS_exit
+                    \\ l.ori r3, r0, r0
+                    \\ l.sys 1
+                    :
+                    : [ptr] "r" (@intFromPtr(self.mapped.ptr)),
+                      [len] "r" (self.mapped.len),
+                    : .{ .memory = true }),
                 .powerpc, .powerpcle, .powerpc64, .powerpc64le => asm volatile (
                     \\  li 0, 91 # SYS_munmap
                     \\  mr 3, %[ptr]