diff --git a/libc/src/sys/mman/linux/CMakeLists.txt b/libc/src/sys/mman/linux/CMakeLists.txt
index 163e7dead8887..08694ec48be39 100644
--- a/libc/src/sys/mman/linux/CMakeLists.txt
+++ b/libc/src/sys/mman/linux/CMakeLists.txt
@@ -22,6 +22,9 @@ add_entrypoint_object(
     libc.include.sys_syscall
     libc.src.__support.OSUtil.osutil
     libc.src.errno.errno
+  COMPILE_OPTIONS
+    # TODO: https://github.com/llvm/llvm-project/issues/77395
+    -Wno-shorten-64-to-32
 )
 
 add_entrypoint_object(