diff --git a/core/java/src/net/i2p/client/datagram/I2PDatagramDissector.java b/core/java/src/net/i2p/client/datagram/I2PDatagramDissector.java
index e40114293..0e23825ef 100644
--- a/core/java/src/net/i2p/client/datagram/I2PDatagramDissector.java
+++ b/core/java/src/net/i2p/client/datagram/I2PDatagramDissector.java
@@ -88,7 +88,9 @@ public final class I2PDatagramDissector {
             
             // read payload
             rxPayloadLen = dgStream.read(rxPayload);
-            
+            if (rxPayloadLen < 0)
+                rxPayloadLen = 0;
+
             // calculate the hash of the payload
             if (type == SigType.DSA_SHA1) {
                 if (rxHash == null)