diff --git a/core/src/main/java/org/nanohttpd/protocols/http/HTTPSession.java b/core/src/main/java/org/nanohttpd/protocols/http/HTTPSession.java
index 80456b06..4f86c809 100644
--- a/core/src/main/java/org/nanohttpd/protocols/http/HTTPSession.java
+++ b/core/src/main/java/org/nanohttpd/protocols/http/HTTPSession.java
@@ -157,6 +157,7 @@ private void decodeHeader(BufferedReader in, Map<String, String> pre, Map<String
                 decodeParms(uri.substring(qmi + 1), parms);
                 uri = NanoHTTPD.decodePercent(uri.substring(0, qmi));
             } else {
+                queryParameterString = "";
                 uri = NanoHTTPD.decodePercent(uri);
             }