--- a/xt_FULLCONENAT.c
+++ b/xt_FULLCONENAT.c
@@ -325,7 +325,11 @@
     /* for now we do the same thing for both --random and --random-fully */
 
     /* select a random starting point */
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(6, 1, 0)
+    start = (uint16_t)(get_random_u32() % (u32)range_size);
+#else
     start = (uint16_t)(prandom_u32() % (u32)range_size);
+#endif
   } else {
 
     if ((original_port >= min && original_port <= min + range_size - 1)
@@ -995,7 +999,11 @@
     /* for now we do the same thing for both --random and --random-fully */
 
     /* select a random starting point */
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(6, 1, 0)
+    start = (uint16_t)(get_random_u32() % (u32)range_size);
+#else
     start = (uint16_t)(prandom_u32() % (u32)range_size);
+#endif
   } else {
 
     if ((original_port >= min && original_port <= min + range_size - 1)