diff --git a/plugins/input/gdal/gdal_featureset.cpp b/plugins/input/gdal/gdal_featureset.cpp
index 4eaaee0cc..1bd141f3b 100644
--- a/plugins/input/gdal/gdal_featureset.cpp
+++ b/plugins/input/gdal/gdal_featureset.cpp
@@ -114,9 +114,9 @@ feature_ptr gdal_featureset::get_feature(mapnik::query const& q)
       x_off = 0;
    if (y_off < 0)
       y_off = 0;
-   if (end_x > raster_width)
+   if (end_x > (int)raster_width)
       end_x = raster_width;
-   if (end_y > raster_height)
+   if (end_y > (int)raster_height)
       end_y = raster_height;
    int width = end_x - x_off;
    int height = end_y - y_off;