diff --git a/src/HttpClient.cpp b/src/HttpClient.cpp
index 7517eea..33ac681 100644
--- a/src/HttpClient.cpp
+++ b/src/HttpClient.cpp
@@ -542,7 +542,7 @@ bool HttpClient::endOfHeadersReached()
     return (iState == eReadingBody || iState == eReadingChunkLength || iState == eReadingBodyChunk);
 };
 
-int HttpClient::contentLength()
+long HttpClient::contentLength()
 {
     // skip the response headers, if they haven't been read already 
     if (!endOfHeadersReached())