diff --git a/kool/src/main/java/org/davidmoten/kool/BufferBuilder.java b/kool/src/main/java/org/davidmoten/kool/BufferBuilder.java
index cbbe01c..42a1b81 100644
--- a/kool/src/main/java/org/davidmoten/kool/BufferBuilder.java
+++ b/kool/src/main/java/org/davidmoten/kool/BufferBuilder.java
@@ -4,6 +4,7 @@
 import java.util.List;
 import java.util.concurrent.Callable;
 
+import org.davidmoten.kool.function.BiConsumer;
 import org.davidmoten.kool.function.BiFunction;
 import org.davidmoten.kool.function.BiPredicate;
 import org.davidmoten.kool.function.Function;
@@ -93,6 +94,11 @@ public BuilderHasAccumulator<T, S> accumulator(BiFunction<? super S, ? super T,
             b.accumulator = accumulator;
             return new BuilderHasAccumulator<T, S>(b);
         }
+        
+        public BuilderHasAccumulator<T, S> accumulator(BiConsumer<? super S, ? super T> accumulator) {
+            b.accumulator = (buffer, t) -> {accumulator.accept(buffer, t); return buffer;};
+            return new BuilderHasAccumulator<T, S>(b);
+        }
     }
 
     public static final class BuilderHasAccumulator<T, S> {