diff --git a/src/unix/bsd/netbsdlike/netbsd/mod.rs b/src/unix/bsd/netbsdlike/netbsd/mod.rs
index a5a2fc61d507d..9b3c398503a0e 100644
--- a/src/unix/bsd/netbsdlike/netbsd/mod.rs
+++ b/src/unix/bsd/netbsdlike/netbsd/mod.rs
@@ -1680,7 +1680,7 @@ extern "C" {
     pub fn pthread_setname_np(
         t: ::pthread_t,
         name: *const ::c_char,
-        arg: *mut ::c_void,
+        arg: *const ::c_void,
     ) -> ::c_int;
     pub fn pthread_attr_get_np(
         thread: ::pthread_t,