diff --git a/runtime/src/main/java/org/capnproto/BufferedInputStreamWrapper.java b/runtime/src/main/java/org/capnproto/BufferedInputStreamWrapper.java
index 885cc61..6419a83 100644
--- a/runtime/src/main/java/org/capnproto/BufferedInputStreamWrapper.java
+++ b/runtime/src/main/java/org/capnproto/BufferedInputStreamWrapper.java
@@ -50,6 +50,7 @@ public final class BufferedInputStreamWrapper implements BufferedInputStream {
             } else {
                 //# Forward large read to the underlying stream.
                 this.buf.clear();
+                this.buf.limit(0);
                 return fromFirstBuffer + readAtLeast(this.inner, dst, numBytes);
             }
         }