diff --git a/include/message.h b/include/message.h
index 21a5767..5b1bb02 100644
--- a/include/message.h
+++ b/include/message.h
@@ -94,10 +94,10 @@ protected:
             size = std::min(size, _bodySize - _filled);
             
             // append more data
-            memcpy(_body + _filled, buffer, size);
+            memcpy(_body + _filled, buffer, (size_t)size);
             
             // update filled data
-            _filled += size;
+            _filled += (size_t)size;
         }
         else if (size >= _bodySize)
         {
@@ -108,16 +108,16 @@ protected:
         else
         {
             // allocate the buffer
-            _body = (char *)malloc(_bodySize);
+            _body = (char *)malloc((size_t)_bodySize);
             
             // remember that the buffer was allocated, so that the destructor can get rid of it
             _allocated = true;
             
             // append more data
-            memcpy(_body, buffer, std::min(size, _bodySize));
+            memcpy(_body, buffer, std::min((size_t)size, (size_t)_bodySize));
             
             // update filled data
-            _filled = std::min(size, _bodySize);
+            _filled = std::min((size_t)size, (size_t)_bodySize);
         }
             
         // check if we're done
diff --git a/src/connectionimpl.cpp b/src/connectionimpl.cpp
index 756e084..332e106 100644
--- a/src/connectionimpl.cpp
+++ b/src/connectionimpl.cpp
@@ -125,7 +125,7 @@ uint64_t ConnectionImpl::parse(const Buffer &buffer)
         try
         {
             // try to recognize the frame
-            ReducedBuffer reduced_buf(buffer, processed);
+            ReducedBuffer reduced_buf(buffer, (size_t)processed);
             ReceivedFrame receivedFrame(reduced_buf, _maxFrame);
             
             // do we have the full frame?