diff --git a/libc-test/semver/dragonfly.txt b/libc-test/semver/dragonfly.txt
index e73dd3dc7e7de..e27bfa41831a8 100644
--- a/libc-test/semver/dragonfly.txt
+++ b/libc-test/semver/dragonfly.txt
@@ -1383,6 +1383,7 @@ lutimes
 lwp_rtprio
 lwpid_t
 madvise
+malloc_usable_size
 mcontext_t
 memmem
 memrchr
diff --git a/src/unix/bsd/freebsdlike/freebsd/mod.rs b/src/unix/bsd/freebsdlike/freebsd/mod.rs
index 633d1dac39c5c..4138af576e936 100644
--- a/src/unix/bsd/freebsdlike/freebsd/mod.rs
+++ b/src/unix/bsd/freebsdlike/freebsd/mod.rs
@@ -5273,7 +5273,6 @@ extern "C" {
     pub fn fls(value: ::c_int) -> ::c_int;
     pub fn flsl(value: ::c_long) -> ::c_int;
     pub fn flsll(value: ::c_longlong) -> ::c_int;
-    pub fn malloc_usable_size(ptr: *const ::c_void) -> ::size_t;
     pub fn malloc_stats_print(
         write_cb: unsafe extern "C" fn(*mut ::c_void, *const ::c_char),
         cbopaque: *mut ::c_void,
diff --git a/src/unix/bsd/freebsdlike/mod.rs b/src/unix/bsd/freebsdlike/mod.rs
index ab12ddc785971..fe69ca42044ca 100644
--- a/src/unix/bsd/freebsdlike/mod.rs
+++ b/src/unix/bsd/freebsdlike/mod.rs
@@ -1571,6 +1571,7 @@ extern "C" {
         mode: ::mode_t,
         dev: dev_t,
     ) -> ::c_int;
+    pub fn malloc_usable_size(ptr: *const ::c_void) -> ::size_t;
     pub fn mincore(addr: *const ::c_void, len: ::size_t, vec: *mut ::c_char) -> ::c_int;
     pub fn newlocale(mask: ::c_int, locale: *const ::c_char, base: ::locale_t) -> ::locale_t;
     pub fn nl_langinfo_l(item: ::nl_item, locale: ::locale_t) -> *mut ::c_char;