diff --git a/module/os/freebsd/spl/spl_zlib.c b/module/os/freebsd/spl/spl_zlib.c
index 3644eba77ca1..079801f2d6cc 100644
--- a/module/os/freebsd/spl/spl_zlib.c
+++ b/module/os/freebsd/spl/spl_zlib.c
@@ -240,3 +240,30 @@ z_uncompress(void *dest, size_t *destLen, const void *source, size_t sourceLen)
 
 	return (err);
 }
+
+#if 0
+int
+spl_zlib_init(void)
+{
+	int size;
+
+	size = MAX(spl_zlib_deflate_workspacesize(MAX_WBITS, MAX_MEM_LEVEL),
+	    zlib_inflate_workspacesize());
+
+	zlib_workspace_cache = kmem_cache_create(
+	    "spl_zlib_workspace_cache",
+	    size, 0, NULL, NULL, NULL, NULL, NULL,
+	    KMC_VMEM | KMC_NOEMERGENCY);
+	if (!zlib_workspace_cache)
+		return (1);
+
+	return (0);
+}
+
+void
+spl_zlib_fini(void)
+{
+	kmem_cache_destroy(zlib_workspace_cache);
+	zlib_workspace_cache = NULL;
+}
+#endif