diff --git a/include/utils.h b/include/utils.h
index 9b53636..c0a5c1b 100644
--- a/include/utils.h
+++ b/include/utils.h
@@ -226,8 +226,7 @@ struct Pool {
   bool is_valid(uint64_t index) const {
     uint32_t id = (uint32_t)(index & 0xFFFFFFFFULL);
     uint32_t gen = (uint32_t)(index >> 32);
-    return id >= 0
-           && id < slots.size()
+    return id < slots.size()
            && slots[id].alive
            && slots[id].generation == gen;
   }
@@ -243,4 +242,4 @@ private:
   std::vector<uint32_t> free_indices;
 };
 
-#endif
\ No newline at end of file
+#endif