diff --git a/json-path/src/main/java/com/jayway/jsonpath/internal/ParseContextImpl.java b/json-path/src/main/java/com/jayway/jsonpath/internal/ParseContextImpl.java
index 976f8481..d03790ba 100644
--- a/json-path/src/main/java/com/jayway/jsonpath/internal/ParseContextImpl.java
+++ b/json-path/src/main/java/com/jayway/jsonpath/internal/ParseContextImpl.java
@@ -46,7 +46,7 @@ public class ParseContextImpl implements ParseContext {
     @Override
     public DocumentContext parse(InputStream json, String charset) {
         notNull(json, "json input stream can not be null");
-        notNull(json, "charset can not be null");
+        notNull(charset, "charset can not be null");
         try {
             Object obj = configuration.jsonProvider().parse(json, charset);
             return new JsonContext(obj, configuration);