diff --git a/src/ens/sequencenumber.c b/src/ens/sequencenumber.c
index 3cd3c27..0c14e34 100644
--- a/src/ens/sequencenumber.c
+++ b/src/ens/sequencenumber.c
@@ -20,9 +20,9 @@ record_sequence_number_t sn_increment_by(record_sequence_number_t sn, uint32_t a
 }
 
 record_sequence_number_t sn_get_middle_sn(record_sequence_number_t older, record_sequence_number_t newer) {
-    if (older < newer) {
+    if (older <= newer) {
         return GET_MASKED_SN(((older + newer) / 2));
     } else {
         return GET_MASKED_SN(((older + newer + SN_MASK) / 2));
     }
-}
\ No newline at end of file
+}