diff --git a/lib/g3-histogram/src/keeping.rs b/lib/g3-histogram/src/keeping.rs
index 89a39664..8424cad6 100644
--- a/lib/g3-histogram/src/keeping.rs
+++ b/lib/g3-histogram/src/keeping.rs
@@ -103,6 +103,7 @@ where
                 for v in buf.iter().take(count) {
                     let _ = self.inner.record(v.as_u64());
                 }
+                buf.clear();
                 stats.update(self.inner());
             }
         });
diff --git a/lib/g3-histogram/src/rotating.rs b/lib/g3-histogram/src/rotating.rs
index c4f102dd..cd6b661d 100644
--- a/lib/g3-histogram/src/rotating.rs
+++ b/lib/g3-histogram/src/rotating.rs
@@ -110,6 +110,7 @@ where
                         for v in buf.iter().take(n) {
                             let _ = self.inner.record(v.as_u64());
                         }
+                        buf.clear();
                     }
                     _ = rotate_interval.tick() => {
                         if !self.inner.is_empty() {