diff --git a/crates/rlsf/src/tlsf.rs b/crates/rlsf/src/tlsf.rs
index e3afdad..f16a5b5 100644
--- a/crates/rlsf/src/tlsf.rs
+++ b/crates/rlsf/src/tlsf.rs
@@ -1545,7 +1545,7 @@ impl<'pool, FLBitmap: BinInteger, SLBitmap: BinInteger, const FLLEN: usize, cons
         core::iter::from_fn(move || {
             let _ = &start;
 
-            if len == 0 {
+            if len < GRANULARITY * 2 {
                 None
             } else {
                 let block_hdr = &*(start.0 as *const BlockHdr);