diff --git a/srtp/srtp.c b/srtp/srtp.c
index 0b91add04..291dcbb94 100644
--- a/srtp/srtp.c
+++ b/srtp/srtp.c
@@ -4906,10 +4906,10 @@ srtp_err_status_t srtp_stream_list_insert(srtp_stream_list_t list,
 {
     /*
      * there is no space to hold the new entry in the entries buffer,
-     * double the size of the buffer.
+     * increase the size of the buffer by a factor of 1.5.
      */
     if (list->size == list->capacity) {
-        size_t new_capacity = list->capacity * 2;
+        size_t new_capacity = list->capacity + ((list->capacity + 1u) / 2u);
         list_entry *new_entries =
             srtp_crypto_alloc(sizeof(list_entry) * new_capacity);
         if (new_entries == NULL) {