diff --git a/perf/src/sigverify.rs b/perf/src/sigverify.rs
index 956a44d23b7e23..3d9ab51146522b 100644
--- a/perf/src/sigverify.rs
+++ b/perf/src/sigverify.rs
@@ -527,7 +527,7 @@ pub fn shrink_batches(batches: &mut Vec<PacketBatch>) -> usize {
                         done = true;
                         break;
                     }
-                    ii += 1;
+                    ii = ii.saturating_add(1);
                 }
                 if ii >= batches[i].packets.len() {
                     ii = 0;
@@ -539,7 +539,7 @@ pub fn shrink_batches(batches: &mut Vec<PacketBatch>) -> usize {
         jj = 0;
         j = j.saturating_add(1);
     }
-    last + 1
+    last.saturating_add(1)
 }
 
 pub fn ed25519_verify_cpu(batches: &mut [PacketBatch], reject_non_vote: bool, packet_count: usize) {