diff --git a/src/core.rs b/src/core.rs
index 58c1000..7aacf6a 100644
--- a/src/core.rs
+++ b/src/core.rs
@@ -522,9 +522,11 @@ impl<T> RandomTable<T>
 where
     T: Clone,
 {
-    pub fn add(&mut self, value: T, weight: u32) -> &mut Self {
-        for _ in 0..weight {
-            self.0.push(value.clone());
+    pub fn add(&mut self, value: T, weight: i32) -> &mut Self {
+        if weight > 0 {
+            for _ in 0..weight {
+                self.0.push(value.clone());
+            }
         }
         self
     }