diff --git a/src/jpeg_reader.cpp b/src/jpeg_reader.cpp
index f7a491307..5af08699e 100644
--- a/src/jpeg_reader.cpp
+++ b/src/jpeg_reader.cpp
@@ -162,7 +162,8 @@ void jpeg_reader<T>::skip(j_decompress_ptr cinfo, long count)
     if (count <= 0) return; //A zero or negative skip count should be treated as a no-op.
     jpeg_stream_wrapper* wrap = reinterpret_cast<jpeg_stream_wrapper*>(cinfo->src);
 
-    if (wrap->manager.bytes_in_buffer > 0 && count < wrap->manager.bytes_in_buffer)
+    if (wrap->manager.bytes_in_buffer > 0u
+        && static_cast<unsigned long>(count) < wrap->manager.bytes_in_buffer)
     {
         wrap->manager.bytes_in_buffer -= count;
         wrap->manager.next_input_byte = &wrap->buffer[BUF_SIZE - wrap->manager.bytes_in_buffer];
@@ -190,7 +191,7 @@ void jpeg_reader<T>::attach_stream (j_decompress_ptr cinfo, input_stream* in)
         cinfo->src = (struct jpeg_source_mgr *)
             (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT, sizeof(jpeg_stream_wrapper));
     }
-    jpeg_reader::jpeg_stream_wrapper * src = reinterpret_cast<jpeg_reader::jpeg_stream_wrapper*> (cinfo->src);
+    typename jpeg_reader::jpeg_stream_wrapper * src = reinterpret_cast<typename jpeg_reader::jpeg_stream_wrapper*> (cinfo->src);
     src->manager.init_source = init_source;
     src->manager.fill_input_buffer = fill_input_buffer;
     src->manager.skip_input_data = skip;
diff --git a/src/png_reader.cpp b/src/png_reader.cpp
index fa0ec9821..91d0d4f46 100644
--- a/src/png_reader.cpp
+++ b/src/png_reader.cpp
@@ -110,7 +110,7 @@ void png_reader<T>::png_read_data(png_structp png_ptr, png_bytep data, png_size_
 {
     ifstream * fin = reinterpret_cast<ifstream*>(png_get_io_ptr(png_ptr));
     fin->read(reinterpret_cast<char*>(data), length);
-    if (fin->gcount() != length)
+    if (fin->gcount() != static_cast<std::streamsize>(length))
     {
         png_error(png_ptr, "Read Error");
     }